Ohm'S Law
Mechanics & Motion - Related Topics
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Analog Electronics
8Analog electronics is a branch of electronics that deals with continuous signals, as opposed to digital electronics, which deals with discrete sign...
Magnetostatics Definition Properties Differences
4051In magnetostatics, boundary conditions are used to describe the behavior of magnetic fields at the interfaces between different materials. These co...
Aberration Of Lens
4054Lens aberration is a phenomenon that occurs when light rays passing through a lens do not converge at a single point, resulting in a distorted or i...
Absorption Spectrum
4055An absorption spectrum is a graph that shows the amount of light absorbed by a substance as a function of the wavelength of light. It is a characte...
AC Circuit
4056An alternating current (AC) circuit is a circuit in which the current periodically reverses direction. This is in contrast to a direct current (DC)...
AC Motor
4057An AC motor is an electric motor that converts alternating current (AC) into mechanical energy. AC motors are widely used in industrial and commerc...
Acceleration Time Graph
4058An acceleration time graph is a graphical representation of the acceleration of an object over time. It is a useful tool for analyzing the motion o...
Acoustics
4059Acoustics is the science that deals with the production, control, transmission, reception, and effects of sound. It is a branch of physics that stu...
Adiabatic Demagnetization
4060Paramagnetic materials are a class of materials that exhibit a weak attraction to magnetic fields. This attraction is caused by the presence of unp...
Advanced Sunrise And Delayed Sunset
4061The rising and setting of the sun are daily phenomena that mark the beginning and end of each day. While we generally think of these events as occu...
Ammeter
4062An ammeter is a measuring instrument used to measure the strength of an electric current in amperes. It is a device that allows the user to determi...
Anemometer
4064An anemometer is a device used to measure wind speed and direction. It is commonly used in meteorology, climatology, and other fields that require ...
Angular Acceleration
4065Angular acceleration is the rate at which an object's angular velocity changes. It is measured in radians per second squared (rad/s²).
Dynamic Lift
4067Dynamic lift is a phenomenon that occurs when an object moves through a fluid, such as air or water. It is the force that acts perpendicular to the...
Layers Of Sun
4067The Sun, our closest star, is a hot ball of glowing gases that emits vast amounts of energy. It consists of several layers, each with its unique ch...
LCR Series Circuit
4068An LCR series circuit is a circuit that consists of an inductor (L), a capacitor (C), and a resistor (R) connected in series. The current in an LCR...
Effects Of Radiation
4069Radiation is the emission or transmission of energy in the form of waves or particles. It can be classified into two main types: ionizing and non-i...
Lemon Battery
4069A lemon battery is a simple electrochemical cell that uses a lemon as the electrolyte. It is a fun and easy way to demonstrate the principles of el...
Limitations Of Ohms Law
4072Ohm's law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance...
Power Factor
4074Power factor is a measure of how efficiently electrical power is used in an alternating current (AC) circuit. It is defined as the ratio of the rea...
Power In Ac Circuit
4075In an alternating current (AC) circuit containing a pure resistor, the current and voltage are in phase, meaning they reach their maximum and minim...
Power Transformers
4076Power transformers are essential components of electrical power systems, enabling the efficient transmission and distribution of electricity. Their...
Pressure Gauge
4077A pressure gauge is a device used to measure the pressure of a fluid (liquid or gas) or gas. It is typically used in industrial and commercial sett...
Pressure Of An Ideal Gas
4078The ideal gas law is a fundamental equation in physics that describes the behavior of gases under various conditions. It provides a mathematical re...
Pressure
4079Pressure is a physical quantity that measures the force applied perpendicular to the surface of an object per unit area. It is a scalar quantity, m...
Principle Of Calorimetry
4080A calorimeter is a device used to measure the amount of heat released or absorbed during a chemical reaction or physical change. It is an essential...
Electrolytic Capacitor
4081Electrolytic capacitors are polarized capacitors that use an electrolytic solution as one of the plates. They are typically made of aluminum or tan...
Propagation Constant
4081The propagation constant is a complex number that describes how a wave propagates through a medium. It is defined as the square root of the product...
Proton Mass
4083The proton is a subatomic particle that is found in the nucleus of an atom. It is one of the three main types of subatomic particles, along with th...
Electron Spin
4084Electron spin is a fundamental property of electrons, which is related to their intrinsic angular momentum. It is a vector quantity and can be eith...
Pulley System
4084A pulley system is a mechanical device that consists of one or more pulleys and a rope or cable that runs through them. Pulleys are used to lift or...
Electronic Communication Systems
4085A communication system is a collection of components that allows information to be transmitted from one place to another. In electronics, communica...
Pulse Width Modulation
4085Pulse Width Modulation (PWM) is a technique used to control the power delivered to a load by varying the width of the pulses of a periodic waveform...
Electroscope
4086An electroscope is a simple device used to detect the presence and type of electric charge. It consists of a metal rod with a small, lightweight ob...
Quantization
4086Quantization is a process of converting a continuous signal into a discrete signal. This is done by dividing the continuous signal into a finite nu...
Electrostatic Precipitator
4087An electrostatic precipitator (ESP) is a device that removes particulate matter from a gas stream by applying an electrical charge to the particles...
Electrostatics
4088In electrostatics, boundary conditions are the conditions that must be satisfied by the electric field and the electric potential at the boundaries...
Radiation Pressure
4089Radiation pressure is the force exerted on an object by electromagnetic radiation. It is a real and measurable force, although it is usually very s...
Radiation
4090Radiation is the emission or transmission of energy in the form of waves or particles. It can be classified into two types: ionizing and non-ionizing.
Radioactivity
4091Radioactivity is the process by which unstable atoms lose energy by emitting radiation in the form of particles or electromagnetic waves. This proc...
Faraday Constant
4092The Faraday constant, denoted by the symbol F, is a fundamental physical constant that relates the charge of one mole of electrons to the amount of...
Radius Of Gyration
4092The radius of gyration is a measure of the distribution of mass within an object. It is defined as the distance from the object's center of mass to...
Ferromagnetism
4093Ferromagnetic materials are a class of materials that exhibit strong magnetic properties due to the alignment of their atomic magnetic moments. The...
Raman Scattering
4093Raman scattering is a spectroscopic technique used to study vibrational, rotational, and other low-frequency modes in a system. It is based on the ...
Rare Earth Magnets
4094Rare earth magnets are a class of permanent magnets made from alloys of rare earth elements. They are the most powerful type of permanent magnet, a...
Force Between Multiple Charges
4095The magnitude of the electrostatic force between two point charges is given by Coulomb's law:
Force
4096Force is a physical quantity that describes an interaction that can change the motion of an object. It is measured in newtons (N) in the Internatio...
Reactance And Impedance
4096Reactance and impedance are two important concepts in electrical engineering. They are used to describe the behavior of electrical circuits when al...
Rectifier
4097A rectifier is an electrical device that converts alternating current (AC) into direct current (DC). The process of converting AC to DC is known as...
Friction
4098Friction is the force that opposes the relative motion of two objects in contact. It is a fundamental force in nature that affects everything from ...
Frictional Force
4099Frictional force is the force that opposes the relative motion of two objects in contact. It is a non-conservative force, meaning that the work don...
Galilean Transformation
4100The Galilean transformation is a mathematical transformation that describes the relationship between the coordinates of an object in two different ...
Refractive Index
4100The refractive index of a material is a measure of how much light bends when passing through it. It is defined as the ratio of the speed of light i...
Gauge
4101A gauge is a type of meter that measures the magnitude of a physical quantity. Gauges are used in a wide variety of applications, including measuri...
Refrigeration
4101Refrigeration is the process of removing heat from a substance or space, resulting in a lower temperature. It is used in a wide range of applicatio...
Geiger Counter
4102A Geiger counter is a device used to detect and measure ionizing radiation, such as gamma rays and X-rays. It is named after the German physicist H...
Relation Between Amplitude And Frequency
4102In physics, amplitude and frequency are two fundamental properties of a periodic wave. Amplitude refers to the maximum displacement of a wave from ...
Relation Between Bar And Atm
4103Pressure is a physical quantity that measures the force applied perpendicular to the surface of an object per unit area. It is a scalar quantity, m...
Hall Effect
4104The Hall effect is the production of a voltage difference (the Hall voltage) across a conductor, usually a metal, when it is subjected to a magneti...
Relation Between Beta And Gamma Function
4104The Beta function and the Gamma function are two closely related special functions that play a fundamental role in various areas of mathematics, st...
Halleys Comet
4105Halley's Comet is a bright comet that orbits the Sun every 75 to 76 years. It is one of the most famous comets in history and has been observed by ...
Relation Between Critical Angle And Refractive Index
4105The critical angle, also known as the limiting angle, is a crucial concept in the field of optics, particularly in the study of light refraction an...
Harmonic Oscillator
4106A harmonic oscillator is a system that, when displaced from its equilibrium position, experiences a restoring force proportional to the displacemen...
Relation Between Escape Velocity And Orbital Velocity
4107Escape velocity is the minimum speed an object needs to escape the gravitational pull of a massive body, such as a planet or moon. Once an object r...
Relation Between Kp And Kc
4108In chemistry, $Kp$ refers to the equilibrium constant for a chemical reaction expressed in terms of partial pressures of the gaseous reactants and ...
Relation Between Newton And Dyne
4109English mathematician and physicist who is widely credited as one of the most influential scientists of all time.
Humidity
4110Humidity refers to the amount of water vapor present in the air. It is an essential component of the Earth's atmosphere and plays a crucial role in...
Relation Between Pressure And Density
4110Pressure and density are two fundamental properties of matter that are closely related. Pressure is the force per unit area exerted by a substance,...
Huygens Principle
4111Huygens' principle is a method for understanding how waves propagate. It was developed by the Dutch scientist Christiaan Huygens in the 17th centur...
Relation Between Youngs Modulus And Bulk Modulus
4111Young's modulus, also known as the modulus of elasticity, is a measure of the stiffness of a material. It is defined as the ratio of the stress (fo...
Relative Humidity
4112Relative humidity (RH) is a measure of the amount of water vapor present in the air compared to the maximum amount of water vapor the air can hold ...
Hydrostatic Pressure
4113Hydrostatic pressure is the pressure exerted by a fluid at rest due to the force of gravity. It is a scalar quantity and is measured in pascals (Pa...
Resistivity
4113Resistivity is a measure of how strongly a material opposes the flow of electric current. It is defined as the electrical resistance of a material ...
Hysteresis
4114A hysteresis loop is a graphical representation of the relationship between the magnetic field strength (H) and the magnetization (M) of a material...
Resistor
4114A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resis...
Infrared Radiation
4115Infrared radiation (IR) is a type of electromagnetic radiation that is invisible to the human eye. It is located on the electromagnetic spectrum be...
Resolving Power
4115Resolving power is the ability of an optical instrument to distinguish between two closely spaced objects. It is usually measured in terms of the m...
Integrated Circuit
4116An integrated circuit (IC), also known as a chip or microchip, is a small electronic circuit made of semiconductor material that has been fabricate...
Resonance
4116Resonance is a phenomenon that occurs when a system is subjected to a periodic force that matches its natural frequency of vibration. This causes t...
Reverberation
4117Reverberation is the persistence of sound in a space after the sound source has stopped. It is caused by the reflection of sound waves off surfaces...
International Space Station
4118The International Space Station (ISS) is a modular space station in low Earth orbit. It is a joint project of five participating space agencies: NA...
Rheostat
4118A rheostat is a variable resistor used to control the flow of electric current. It consists of a resistive element, usually a wire, and a sliding c...
Ionizing Radiation
4119Ionizing radiation is a type of high-energy radiation that has enough energy to remove tightly bound electrons from atoms, resulting in the formati...
Satellite Communication
4119Satellite communication is a type of wireless communication that uses satellites to relay signals between two or more points on Earth. It is used f...
Isothermal Process
4120An isothermal process is a thermodynamic process in which the temperature of the system remains constant. This means that the internal energy of th...
Scintillation Counter
4120A scintillation counter is a device used to detect and measure ionizing radiation. It consists of a scintillator, a photomultiplier tube (PMT), and...
James Webb Space Telescope
4121The James Webb Space Telescope (JWST) is a space telescope under construction and development by NASA, the European Space Agency (ESA) and the Cana...
Seebeck Effect
4121The Seebeck effect is the conversion of temperature differences directly into electrical energy. It is named after the German physicist Thomas Joha...
Junction Field Effect Transistor
4122A Junction Field-Effect Transistor (JFET) is a type of field-effect transistor that uses a semiconductor junction to control the flow of current. J...
Seismograph
4122A seismograph is a device that records the motion of the ground during an earthquake. The first seismographs were invented in China in the 2nd cent...
Junction Transistor
4123A junction transistor is a semiconductor device that acts as an electronic switch or an amplifier. It is made of three layers of semiconductor mate...
Sharpness Of Resonance
4123Resonance is a phenomenon that occurs when a system is subjected to a periodic force whose frequency is equal to or close to the system's natural f...
Shear Stress
4124Shear stress is the force per unit area that acts parallel to the surface of a material and causes it to deform. It is expressed in units of pascal...
Kinetic Friction
4125Kinetic friction is the force that opposes the motion of an object when it is in contact with another surface and moving relative to that surface. ...
Lambert Cosine Law
4126Lambert's Cosine Law, also known as the cosine emission law, describes the relationship between the intensity of light emitted by a surface and the...
Sliding Friction
4126Sliding friction is the force that opposes the relative motion of two solid surfaces in contact. It is a type of kinetic friction, which is the for...
Laplace Correction
4127Laplace correction is a technique used in probability theory and statistics to adjust the probabilities of events in order to account for the fact ...
Solar Eclipse
4127A solar eclipse occurs when the Moon passes between the Sun and Earth, and the Moon's shadow falls on Earth's surface. Solar eclipses are rare even...
Laser Diode
4128A laser diode is a semiconductor device that emits coherent light when an electric current is passed through it. Laser diodes are used in a wide va...
Solenoid Engine
4128A solenoid is an electromechanical device that converts electrical energy into mechanical energy. It consists of a coil of wire wrapped around a me...
Laser
4129A laser is a device that emits light through a process called stimulated emission. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".
Solenoid
4129A solenoid is an electromechanical device that converts electrical energy into mechanical energy. It consists of a coil of wire wrapped around a me...
Millikan Oil Drop Experiment
4130The Millikan oil drop experiment was a series of experiments conducted by Robert Millikan and Harvey Fletcher between 1909 and 1913. The experiment...
Solid State Physics
4130Solid-state physics is the study of the physical properties of solids, including their electronic structure, thermal properties, mechanical propert...
Sonication
4131Sonification is the process of converting data into sound. This can be done for a variety of purposes, such as:
Moon
4132The Moon is the fifth largest moon in the Solar System and the largest in our own. It is a natural satellite of Earth, orbiting it at an average di...
Sonometer
4132A sonometer is a scientific instrument used to measure the frequency of sound waves. It consists of a stretched string, a fixed pulley, a movable p...
Motion In A Plane
4133Motion in a plane is the movement of an object in two dimensions. It can be described by the object's position, velocity, and acceleration.
Murphys Law
4134Murphy's Law is a popular adage that states that "anything that can go wrong, will go wrong." It is often used to describe the unexpected and often pessimistic nature of real-world situations.
Navier Stokes Equation
4135The Navier-Stokes equations are a set of partial differential equations that describe the motion of viscous fluids. They are named after the French...
Special Theory Of Relativity
4135The Special Theory of Relativity, proposed by Albert Einstein in 1905, is a fundamental theory in physics that describes the relationship between s...
Specific Gravity
4136Specific gravity is a measure of the density of a substance relative to the density of water. It is defined as the ratio of the density of a substa...
Newtons Law Of Viscosity
4137Viscosity is a property of fluids that describes their resistance to flow. It is caused by the interaction of the molecules in the fluid, which col...
Newtons Second Law Of Motion
4138Newton's Second Law of Motion is a fundamental principle in classical mechanics that describes the relationship between an object's mass, accelerat...
Speed And Velocity
4138Speed is a measure of how fast an object is moving. It is calculated by dividing the distance traveled by the time taken to travel that distance. S...
Newton's Third Law Of Motion
4139Complete guide to Newton's third law including action-reaction pairs, applications, examples, rocket propulsion for NEET physics
Normal Force
4140In physics, the normal force is the force exerted by a surface on an object in contact with it, perpendicular to the surface. It is also known as t...
Nuclear Force
4141Nuclear force is the force that holds protons and neutrons together inside an atomic nucleus. It is one of the four fundamental forces in nature, a...
Optical Bench
4143An optical bench is a stable platform used to hold and align optical components, such as lenses, mirrors, and prisms, in a precise and repeatable m...
Paramagnetism
4144Paramagnetism is a form of magnetism that occurs when certain materials are exposed to an external magnetic field. These materials, known as parama...
Pendulum
4145A pendulum is a weight suspended from a pivot so that it can swing freely. When the pendulum is displaced from its equilibrium position, it will os...
Periscope
4146Periscope is a live video streaming app that allows users to broadcast live video to their followers. It was launched in 2015 and was acquired by T...
Angular Momentum Of Electron
4152In quantum mechanics, the angular momentum of an electron is a fundamental property that describes the electron's rotational motion. It is a vector...
Angular Velocity
4153Angular velocity is a measure of how fast an object is rotating. It is defined as the rate of change of the angular displacement of an object with ...
Antimatter
4154Antimatter is a type of matter that is composed of antiparticles, which are the opposite of their corresponding particles. For example, the antipar...
Average Speed
4155Average speed is the total distance traveled divided by the total time taken to travel that distance. It is a measure of how fast an object is movi...
Avogadro Hypothesis
4156Avogadro's Hypothesis states that under the same conditions of temperature and pressure, equal volumes of gases contain an equal number of molecule...
Balanced Force
4157A balanced force occurs when the net force acting on an object is zero. This means that the forces acting on the object are equal in magnitude and ...
Ballistics
4158Ballistics is the science of the motion of projectiles. It is a branch of physics that deals with the behavior of projectiles in flight, including ...
Band Theory Of Solids
4159The band theory of solids is a fundamental concept in solid-state physics that describes the electronic structure of materials. It provides a frame...
Bar Magnet As An Equivalent Solenoid
4160A bar magnet can be considered as an equivalent solenoid, which is a coil of wire that carries an electric current and creates a magnetic field. Th...
Barometer
4161A barometer is a scientific instrument used to measure atmospheric pressure. It is a device that measures the weight of the air above a given point...
Bells Theorem
4162Bell's theorem is a no-go theorem in quantum mechanics that states that no physical theory can reproduce all the predictions of quantum mechanics w...
Bernoullis Principle
4163Bernoulli's principle is a fundamental principle in fluid dynamics that describes the relationship between fluid velocity, pressure, and height. It...
Bipolar Junction Transistor
4164A bipolar junction transistor (BJT) is a three-terminal electronic device that acts as an amplifier or switch. It is made of semiconductor material...
Black Body Radiation
4165Black body radiation refers to the electromagnetic radiation emitted by an ideal black body. A black body is a theoretical concept that absorbs all...
Boltzmann Constant
4166The Boltzmann constant, denoted by the symbol $kB$, is a fundamental physical constant that relates the average kinetic energy of particles in a sy...
Braille
4167Braille is a tactile writing and reading system used by blind and visually impaired people. It was invented by Louis Braille, a blind Frenchman, in...
Buoyant Force
4168Buoyant force is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In other words, it is the upwa...
Calorimeter
4169A calorimeter is a device used to measure the heat involved in a chemical reaction or physical change. It is typically made of metal and is insulat...
Centre Of Mass And Centre Of Gravity
4170The centre of mass of an object is the point where all of its mass is evenly distributed. It is also known as the centroid or the geometric centre.
Centripetal Force
4171Centripetal force is the net force that acts on an object moving in a circular path, pulling it toward the center of the circle. It is directed tow...
Charge Transfer
4173Charge transfer is the movement of electrons from one atom or molecule to another. It is a fundamental process in chemistry and biology, and it pla...
Charging By Induction
4174Induction charging is a method of wirelessly transferring electrical energy between two objects. It is based on the principle of electromagnetic in...
Cherenkov Radiation
4175Cherenkov radiation is a unique and fascinating optical phenomenon that occurs when a charged particle moves through a medium at a speed greater th...
Circuit Breakers
4176A circuit breaker is a protective device that automatically switches off an electrical circuit when the current exceeds a safe level. This prevents...
Circuit Components
4177An electric circuit is a path that allows electricity to flow. It consists of a source of electrical energy, such as a battery, and a load, such as...
Clausius Statement
4178The Clausius statement of the second law of thermodynamics is one of the fundamental principles of thermodynamics. It states that heat cannot spont...
Coherent Sources
4179In physics, a coherent source is a source of waves that have a constant phase relationship with each other. This means that the waves from a cohere...
Collision
4180Collisions occur when two or more objects come into contact with each other. There are different types of collisions, each with its own characteris...
Commutator
4181A commutator is a mechanical device used in direct current (DC) motors and generators to reverse the direction of current flow in the armature wind...
Compound Microscope
4182A compound microscope is a type of microscope that uses two or more lenses to produce a magnified image of a specimen. The objective lens, which is...
Concave Lens
4184A concave lens, also known as a diverging lens, is a type of lens that causes light rays to diverge (spread out) after passing through it. Unlike a...
Conductor And Insulator
4185Conductors and insulators are two important concepts in the field of electricity. Conductors are materials that allow electricity to flow through t...
Conservative Force
4187A conservative force is a force that does work on an object that depends only on the initial and final positions of the object and not on the path ...
Constellations
4188A constellation is a group of stars that form a recognizable pattern in the night sky. Constellations have been used for centuries by astronomers t...
Convex Mirror
4189A convex mirror is a curved mirror with a reflecting surface that bulges outward. It is also known as a diverging mirror because it causes light ra...
Cyclic Process
4191A cyclic process is a process that repeats itself over and over again. It is a closed loop, with no beginning or end. Cyclic processes are found in...
Cyclotron
4192A cyclotron is a type of particle accelerator that uses a strong magnetic field to accelerate charged particles in a circular path. It was invented...
Davisson Germer Experiment
4193The Davisson-Germer experiment was a landmark experiment in physics that demonstrated the wave-particle duality of matter. It was conducted by Clin...
DC Generator
4194A DC generator is an electrical machine that converts mechanical energy into direct current (DC) electrical energy. It is based on the principle of...
Decibel
4195A decibel (dB) is a unit of measurement used to express the relative intensity of a sound. It is a logarithmic unit, which means that it expresses ...
Delta Modulation
4196Delta modulation (DM) is a simple form of analog-to-digital conversion (ADC) that uses a one-bit quantizer to represent the difference between the ...
Derivation Of Equation Of Motion
4197The equation of motion is a fundamental concept in physics that describes the behavior of objects in motion. It provides a mathematical framework t...
Derivation Of Lorentz Transformation
4198The Lorentz transformation is a mathematical transformation that describes how space and time are related in special relativity. It was developed b...
Derivation Of Potential Energy
4199Complete guide to potential energy derivation including gravitational potential energy, elastic potential energy, chemical potential energy, formula for NEET physics
Derivation Of Prism Formula
4200The prism formula is an equation that describes the angle of deviation of a light ray passing through a prism. It is given by:
Deuterium
4201Deuterium is a naturally occurring isotope of hydrogen with a nucleus containing one proton and one neutron, making it twice as heavy as the most c...
Diamagnetism
4202Diamagnetism is a form of magnetism that occurs in all materials, but it is usually very weak. It is caused by the orbital motion of electrons in r...
Difference Between Centre Of Gravity And Centroid
4206The centre of gravity (CG), also known as the centre of mass, is the point where all the mass of an object is considered to be concentrated. It is ...
Difference Between Echo And Reverberation
4207Sound waves are mechanical waves that travel through a medium, such as air, water, or solids. They are caused by the vibration of particles in the ...
Difference Between Emission And Absorption Spectra
4208Atomic spectra are the characteristic patterns of electromagnetic radiation emitted or absorbed by atoms. They are caused by the transitions of ele...
Difference Between Kinetics And Kinematics
4210Kinetics is the branch of physical chemistry that deals with the rates of chemical reactions. It is a fundamental science that has applications in ...
Difference Between Mirror And Lens
4211A mirror is a reflective surface, usually made of glass with a metallic coating, that reflects light and images. Mirrors are used to see reflection...
Difference Between Real Image And Virtual Image
4212A real image is an image that is formed by the convergence of light rays. It can be projected onto a surface, such as a screen or a wall. Real imag...
Difference Between RTD And Thermocouple
4213RTD stands for Resistance Temperature Detector. It is a temperature sensor that uses the principle of resistance change with temperature to measure...
Difference Between Simple And Compound Microscope
4214A simple microscope, also known as a magnifying glass, is a basic optical instrument that produces magnified images of small objects. It consists o...
Difference Between Solar Eclipse And Lunar Eclipse
4215A solar eclipse occurs when the Moon passes between the Sun and Earth, and the Moon's shadow falls on Earth. This can only happen during a new moon...
Differences Between Acceleration And Velocity
4217In physics, motion is a fundamental concept that describes the change in position of an object over time. Two key concepts related to motion are ve...
Differences Between Enthalpy And Entropy
4218Enthalpy is a thermodynamic property that measures the total energy of a system, including its internal energy and the energy associated with its p...
Diode As A Rectifier
4219A diode is a two-terminal electronic component that allows current to flow in only one direction. This property makes diodes useful for a variety o...
Magnet
4368A magnet is a material or object that produces a magnetic field. This magnetic field is invisible, but it can be detected by its effects on other m...
Manometer
4374A manometer is a device used to measure pressure in a fluid, typically a gas or liquid. It consists of a vertical tube with one end open to the atm...
Mass Of Deuteron
4375A deuteron is a stable isotope of hydrogen with a nucleus containing one proton and one neutron, bound together by the strong nuclear force. It is ...
Mean Free Path
4376The mean free path of a particle is the average distance it travels before undergoing a collision with another particle. It is an important concept...
Permanent Magnet
4377A permanent magnet is a material or object that produces its own magnetic field without the need for an electric current. The magnetic field of a p...
Perpetual Motion
4378Perpetual motion is the idea of a machine that can operate indefinitely without an external energy source. This concept has fascinated inventors an...
Photon
4380A photon is an elementary particle that is the quantum of light and all other forms of electromagnetic radiation. It is the basic unit of light and...
Photovoltaic Cell
4381A photovoltaic (PV) cell, also known as a solar cell, is a device that converts light energy into electrical energy. The process of converting ligh...
Pin Diode
4383A PIN diode is a type of semiconductor diode that has a wide, intrinsic semiconductor region between its p-type and n-type regions. This intrinsic ...
Plane Mirror
4384A plane mirror is a flat, reflective surface that produces an image of an object by reflecting light rays. It is also known as a flat mirror or a l...
PN Junction Diode
4385A PN junction diode is a semiconductor device that allows current to flow in one direction only. It is made by joining two pieces of semiconductor ...
Poissons Ratio
4386Poisson's ratio is a measure of a material's tendency to deform in one direction when subjected to stress in another direction. It is defined as th...
Spherometer
4387A spherometer is a device used to measure the radius of curvature of a spherical surface. It consists of a metal base with a micrometer screw attac...
Sphygmomanometer
4388A sphygmomanometer is a device used to measure blood pressure. It consists of an inflatable cuff wrapped around the upper arm, connected to a manom...
Stars
4390A star is a luminous ball of gas, mostly hydrogen and helium, that produces its own light and heat through nuclear fusion reactions in its core. St...
Static Friction
4391Static friction is the force that opposes the movement of two objects in contact with each other when they are not moving relative to each other. I...
Statistical Mechanics
4392Statistical mechanics is a branch of physics that uses probability theory to describe the macroscopic properties of large systems of particles. It ...
String Theory
4393String theory is a branch of theoretical physics that proposes that the point-like particles of particle physics are not actually points, but rathe...
Synchrotron
4395A synchrotron is a type of particle accelerator that uses electromagnetic fields to propel charged particles to high speeds and energies. Synchrotr...
Tension Force
4396Tension force is a pulling force that acts along the length of an object, tending to stretch or elongate it. It is not one of the four fundamental ...
Terminal Velocity
4397Terminal velocity is the constant speed at which an object falls through a fluid (such as air or water) when the resistance of the fluid to the obj...
The International System Of Units
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Ohm’s Law
Ohm’s Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Mathematically, it can be expressed as:
$$I = \frac{V}{R}$$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
Ohm’s Law helps us understand how electrical circuits behave and allows us to calculate the current, voltage, or resistance in a circuit if we know the other two values. It is essential for designing, analyzing, and troubleshooting electrical circuits and is widely used in various fields such as electronics, power systems, and telecommunications.
Explanation:
To understand Ohm’s Law, let’s consider an analogy with water flowing through a pipe. Voltage is like the pressure that pushes the water through the pipe, current is like the amount of water flowing through the pipe, and resistance is like the friction that opposes the flow of water.
Just as increasing the pressure (voltage) causes more water (current) to flow through a pipe, increasing the voltage across a conductor causes more current to flow through it. Similarly, increasing the friction (resistance) in a pipe reduces the amount of water (current) that can flow through it, just as increasing the resistance of a conductor reduces the amount of current that can flow through it.
Ohm’s Law can be used to calculate the current, voltage, or resistance in a circuit if two of the three quantities are known. For example, if you know the voltage across a conductor and the resistance of the conductor, you can use Ohm’s Law to calculate the current flowing through the conductor.
Here are some examples of Ohm’s Law in action:
A 12-volt battery connected to a 6-ohm resistor will cause a current of 2 amps to flow through the resistor. A 9-volt battery connected to a 3-ohm resistor will cause a current of 3 amps to flow through the resistor. A 6-volt battery connected to a 2-ohm resistor will cause a current of 3 amps to flow through the resistor.
Ohm’s Law is a fundamental principle that is used in the design and analysis of electrical circuits. It is also used to troubleshoot electrical problems and to ensure that electrical systems are operating safely and efficiently.
Relationship Between Voltage, Current, and Resistance
The relationship between voltage, current, and resistance is fundamental to understanding how electrical circuits work. These three quantities are related by Ohm’s law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.
Ohm’s Law
Ohm’s law can be expressed mathematically as follows:
$$I = \frac{V}{R}$$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
Examples
Here are some examples of how Ohm’s law works:
- If you have a 12-volt battery and a 6-ohm resistor, the current flowing through the resistor will be 2 amps (12 V / 6 Ω = 2 A).
- If you have a 9-volt battery and a 3-ohm resistor, the current flowing through the resistor will be 3 amps (9 V / 3 Ω = 3 A).
- If you have a 5-volt battery and a 10-ohm resistor, the current flowing through the resistor will be 0.5 amps (5 V / 10 Ω = 0.5 A).
Resistance
Resistance is a measure of how difficult it is for current to flow through a conductor. The higher the resistance, the less current will flow for a given voltage. Some materials, such as metals, have low resistance, while others, such as insulators, have high resistance.
Factors Affecting Resistance
The resistance of a conductor depends on several factors, including:
- The material of the conductor
- The length of the conductor
- The cross-sectional area of the conductor
- The temperature of the conductor
Conclusion
Ohm’s law is a fundamental principle of electrical circuits. It allows us to calculate the current flowing through a conductor when we know the voltage applied across it and the resistance of the conductor.
Ohm’s Law Water Pipe Analogy
Ohm’s law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. This can be represented mathematically as:
$$I = \frac{V}{R}$$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
The water pipe analogy can be used to help understand Ohm’s law. Imagine a water pipe with a valve that can be used to control the flow of water. The water pressure represents the voltage, the flow of water represents the current, and the resistance of the pipe represents the resistance of the conductor.
When the valve is open, the water flows easily through the pipe and the current is high. When the valve is closed, the water has a harder time flowing through the pipe and the current is low. The resistance of the pipe determines how much the water flow is restricted.
In the same way, the resistance of a conductor determines how much the current is restricted. A conductor with a high resistance will have a low current, while a conductor with a low resistance will have a high current.
Examples
Here are some examples of how the water pipe analogy can be used to understand Ohm’s law:
- A garden hose with a small opening has a high resistance, so the water flow is restricted and the current is low.
- A fire hose with a large opening has a low resistance, so the water flow is not restricted and the current is high.
- A clogged pipe has a high resistance, so the water flow is very restricted and the current is very low.
Ohm’s law is a fundamental principle of electricity and is used in a wide variety of applications, from designing electrical circuits to understanding how electrical devices work. The water pipe analogy is a simple and effective way to help understand Ohm’s law.
Experimental Verification of Ohm’s Law
Ohm’s law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points. In other words, the resistance of a conductor is constant.
This law can be experimentally verified using a simple circuit consisting of a battery, a resistor, and an ammeter. The ammeter is used to measure the current flowing through the circuit, and the voltmeter is used to measure the voltage across the resistor.
If the voltage across the resistor is increased, the current flowing through the circuit will also increase. This is because the resistance of the resistor is constant, so the only way to increase the current is to increase the voltage.
If the resistance of the resistor is increased, the current flowing through the circuit will decrease. This is because the voltage across the resistor is constant, so the only way to decrease the current is to increase the resistance.
The following table shows the results of an experiment to verify Ohm’s law.
Voltage (V) | Current (A) | Resistance (Ω) |
---|---|---|
1 | 0.1 | 10 |
2 | 0.2 | 10 |
3 | 0.3 | 10 |
4 | 0.4 | 10 |
5 | 0.5 | 10 |
As you can see from the table, the resistance of the resistor is constant at 10 Ω. This means that the current flowing through the circuit is directly proportional to the voltage across the resistor.
Ohm’s law is a fundamental law of electricity that is used in a wide variety of applications. It is used to design electrical circuits, calculate the power consumption of electrical devices, and troubleshoot electrical problems.
Ohm’s Law Magic Triangle
Ohm’s law is a fundamental relationship in electrical engineering that describes the relationship between voltage, current, and resistance in a circuit. It is often represented as a triangle, with voltage at the top, current on the left, and resistance on the right.
The magic triangle can be used to solve a variety of problems involving electrical circuits. For example, if you know the voltage and resistance of a circuit, you can use Ohm’s law to calculate the current. Or, if you know the current and resistance, you can calculate the voltage.
Here are some examples of how Ohm’s law can be used to solve problems:
- Example 1: A circuit has a voltage of 12 volts and a resistance of 6 ohms. What is the current in the circuit?
Solution:
$$ I = \frac{V}{R}$$ $$I = \frac{12 \ volts}{6 \ ohms}$$ $$ I = 2 \ amps $$
- Example 2: A circuit has a current of 3 amps and a resistance of 9 ohms. What is the voltage in the circuit?
Solution:
$$ V = I R$$ $$V = 3 \ amps \times 9 \ ohms$$ $$ V = 27 \ volts $$
- Example 3: A circuit has a voltage of 18 volts and a current of 6 amps. What is the resistance in the circuit?
Solution:
$$ R = \frac{V}{I}$$ $$R = \frac{18 \ volts}{6 \ amps}$$ $$R = 3 \ ohms $$
Ohm’s law is a powerful tool that can be used to solve a variety of problems involving electrical circuits. The magic triangle is a convenient way to remember the relationship between voltage, current, and resistance.
Ohm’s Law Solved Problems
Problem 1: A circuit has a resistance of 10 ohms and a current of 2 amps. What is the voltage across the circuit?
Solution:
Ohm’s law states that the voltage across a circuit is equal to the current flowing through the circuit multiplied by the resistance of the circuit. In this case, the voltage is:
$$ V = I R$$ $$V = 2 \ A \times 10 \ ohms$$ $$V = 20 \ volts $$
Therefore, the voltage across the circuit is 20 volts.
Problem 2: A circuit has a voltage of 12 volts and a resistance of 6 ohms. What is the current flowing through the circuit?
Solution:
Ohm’s law states that the current flowing through a circuit is equal to the voltage across the circuit divided by the resistance of the circuit. In this case, the current is:
$$ I = \frac{V}{R}$$ $$I = \frac{12 \ volts}{6 \ ohms}$$ $$I = 2 \ amps $$
Therefore, the current flowing through the circuit is 2 amps.
Problem 3: A circuit has a resistance of 15 ohms and a current of 3 amps. What is the power dissipated by the circuit?
Solution:
The power dissipated by a circuit is equal to the voltage across the circuit multiplied by the current flowing through the circuit. In this case, the power is:
$$ P = V I$$ $$P = 12 \ volts \times 3 \ amps$$ $$P = 36 \ watts $$
Therefore, the power dissipated by the circuit is 36 watts.
Problem 4: A circuit has a voltage of 24 volts and a power dissipation of 48 watts. What is the resistance of the circuit?
Solution:
The resistance of a circuit is equal to the voltage across the circuit divided by the current flowing through the circuit. In this case, the resistance is:
$$ R = \frac{V}{I}$$ $$R = \frac{24 \ volts}{2 \ amps}$$ $$R = 12 \ ohms $$
Therefore, the resistance of the circuit is 12 ohms.
Problem 5: A circuit has a resistance of 10 ohms and a power dissipation of 20 watts. What is the current flowing through the circuit?
Solution:
The current flowing through a circuit is equal to the square root of the power dissipated by the circuit divided by the resistance of the circuit. In this case, the current is:
$$ I = \sqrt \frac{P}{R}$$ $$I = \sqrt \frac{20 \ watts}{10 \ ohms}$$ $$I = 1.41 \ amps $$
Therefore, the current flowing through the circuit is 1.41 amps.
Calculating Electrical Power Using Ohm’s Law
Ohm’s Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Mathematically, it can be expressed as:
$$I = \frac{V}{R}$$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
Electrical power, on the other hand, is the rate at which electrical energy is transferred by an electrical circuit. It is measured in watts (W) and can be calculated using the following formula:
$$P = VI$$
Where:
- $P$ represents the power in watts $(W)$
- $V$ represents the voltage in volts $(V)$
- $I$ represents the current in amperes $(A)$
Combining Ohm’s Law and the formula for electrical power, we can derive the following equation to calculate electrical power:
$$P = \frac{V^2}{R}$$
This equation shows that the power dissipated by a circuit is directly proportional to the square of the voltage and inversely proportional to the resistance.
Examples:
- A circuit has a voltage of 12 volts and a resistance of 6 ohms. Calculate the current flowing through the circuit and the electrical power dissipated.
Using Ohm’s Law:
$$I = \frac{V}{R} = \frac{12 V}{6 Ω} = 2 A$$
Using the formula for electrical power:
$$P = VI = 12 V \times 2 A = 24 W$$
Therefore, the current flowing through the circuit is 2 A, and the electrical power dissipated is 24 W.
- A light bulb has a resistance of 100 ohms and is connected to a 120-volt power source. Calculate the current drawn by the light bulb and the power consumed.
Using Ohm’s Law:
$$I = \frac{V}{R} = \frac{120 V}{100 Ω} = 1.2 A$$
Using the formula for electrical power:
$$P = VI = 120 V \times 1.2 A = 144 W$$
Therefore, the current drawn by the light bulb is 1.2 A, and the power consumed is 144 W.
These examples illustrate how Ohm’s Law and the formula for electrical power can be used to calculate the current and power in electrical circuits.
Ohm’s Law Matrix Table
Ohm’s law is a fundamental relationship in electrical circuits that describes the relationship between voltage, current, and resistance. It states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.
The Ohm’s law matrix table is a convenient way to represent the relationships between voltage, current, and resistance. The table shows the values of voltage, current, and resistance for different combinations of the other two variables.
For example, if the voltage is 12 volts and the resistance is 6 ohms, then the current will be 2 amps. This can be seen by looking at the intersection of the 12-volt row and the 6-ohm column in the table.
The Ohm’s law matrix table can also be used to find the values of voltage and resistance when the current is known. For example, if the current is 3 amps and the resistance is 4 ohms, then the voltage will be 12 volts. This can be seen by looking at the intersection of the 3-amp row and the 4-ohm column in the table.
The Ohm’s law matrix table is a useful tool for understanding and working with electrical circuits. It can be used to quickly and easily find the values of voltage, current, and resistance for different combinations of the other two variables.
Here are some examples of how the Ohm’s law matrix table can be used:
- To find the current flowing through a 10-ohm resistor when 12 volts is applied across it, look at the intersection of the 12-volt row and the 10-ohm column in the table. The current will be 1.2 amps.
- To find the voltage applied across a 5-ohm resistor when 2 amps is flowing through it, look at the intersection of the 2-amp row and the 5-ohm column in the table. The voltage will be 10 volts.
- To find the resistance of a conductor when 1 amp is flowing through it and 12 volts is applied across it, look at the intersection of the 1-amp row and the 12-volt column in the table. The resistance will be 12 ohms.
The Ohm’s law matrix table is a valuable tool for anyone who works with electrical circuits. It can be used to quickly and easily find the values of voltage, current, and resistance for different combinations of the other two variables.
Limitations of Ohm’s Law
Ohm’s law is a fundamental principle in electrical engineering that states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points. In other words, the resistance of the conductor is constant.
However, there are certain limitations to Ohm’s law. These limitations are:
-
Non-Ohmic materials: Ohm’s law only applies to materials that exhibit ohmic behavior, which means that the resistance of the material is constant. However, there are many materials that do not exhibit ohmic behavior, such as semiconductors, diodes, and transistors. In these materials, the resistance changes with the voltage or current.
-
Temperature dependence: The resistance of a material can also change with temperature. This is because the temperature affects the mobility of the charge carriers in the material. As the temperature increases, the mobility of the charge carriers increases, which decreases the resistance of the material.
-
Frequency dependence: The resistance of a material can also change with frequency. This is because the inductive and capacitive reactance of the material can become significant at high frequencies. This can cause the impedance of the material to increase, which decreases the current flow.
-
Non-linearity: Ohm’s law only applies to linear circuits. In a non-linear circuit, the resistance of the circuit changes with the voltage or current. This can cause the current flow to be non-linear, which can lead to distortion.
Examples of limitations of Ohm’s law
-
Semiconductors: Semiconductors are materials that have a resistance that changes with the voltage or current. This is because the number of charge carriers in a semiconductor increases with the voltage or current. This causes the resistance of the semiconductor to decrease.
-
Diodes: Diodes are electronic components that allow current to flow in only one direction. This is because the resistance of a diode is much lower in one direction than it is in the other direction.
-
Transistors: Transistors are electronic components that can be used to amplify or switch electronic signals. This is because the resistance of a transistor can be controlled by a small voltage or current.
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Non-linear circuits: Non-linear circuits are circuits that do not obey Ohm’s law. This is because the resistance of the circuit changes with the voltage or current. This can cause the current flow to be non-linear, which can lead to distortion.
Ohm’s law is a fundamental principle in electrical engineering, but it has certain limitations. These limitations must be taken into account when designing electrical circuits.
Frequently Asked Questions – FAQs
What does Ohm’s law state?
Ohm’s law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor.
Mathematically, Ohm’s law can be expressed as:
$$ I = \frac{V}{R} $$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
Here are some examples to illustrate Ohm’s law:
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Consider a simple circuit with a battery, a resistor, and a voltmeter. When the voltmeter is connected across the resistor, it measures the voltage across the resistor. If the battery voltage is increased, the voltmeter reading will increase proportionally, indicating a higher current flowing through the resistor.
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If the resistor is replaced with a higher resistance value, the voltmeter reading will decrease, indicating a lower current flowing through the resistor. This is because the higher resistance opposes the flow of current.
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If the resistor is replaced with a lower resistance value, the voltmeter reading will increase, indicating a higher current flowing through the resistor. This is because the lower resistance allows more current to flow.
Ohm’s law is a crucial concept in circuit analysis and design. It allows engineers to calculate the current, voltage, and resistance in a circuit, which is essential for ensuring the proper functioning and safety of electrical systems.
What can Ohm’s law be used for?
Ohm’s law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Mathematically, it can be expressed as:
$$ I = \frac{V}{R} $$
Where:
- $I$ represents the current in amperes $(A)$
- $V$ represents the voltage in volts $(V)$
- $R$ represents the resistance in ohms $(Ω)$
Ohm’s law can be used for various purposes in electrical circuits and applications. Here are some examples:
1. Calculating Current: Ohm’s law allows us to calculate the current flowing through a circuit when the voltage and resistance are known. For instance, if a circuit has a voltage of 12 volts and a resistance of 4 ohms, the current can be calculated as:
$$ I = \frac{V}{R} = \frac{12 V}{4 Ω} = 3 A $$
2. Determining Voltage: Similarly, Ohm’s law can be used to determine the voltage across a component or a circuit when the current and resistance are known. For example, if a circuit has a current of 2 amperes and a resistance of 6 ohms, the voltage can be calculated as:
$$ V = I R = 2 A \times 6 Ω = 12 V $$
3. Calculating Resistance: Ohm’s law can also be used to calculate the resistance of a component or a circuit when the voltage and current are known. For instance, if a circuit has a voltage of 9 volts and a current of 3 amperes, the resistance can be calculated as:
$$ R = \frac{V}{I} = \frac{9 V}{3 A} = 3 Ω $$
4. Designing Circuits: Ohm’s law is essential in designing electrical circuits to ensure that the desired current and voltage levels are achieved. By selecting appropriate resistance values, engineers can control the current flow and voltage distribution within a circuit.
5. Troubleshooting Circuits: Ohm’s law can be used to troubleshoot electrical circuits by measuring the voltage, current, and resistance at various points in the circuit. Deviations from expected values can indicate faults or problems within the circuit.
6. Power Calculations: Ohm’s law is also useful in calculating the power consumed or dissipated in a circuit. Power is the rate at which electrical energy is transferred or used, and it can be calculated as:
$$ P = V I $$
Where:
- $P$ represents the power in watts $(W)$
- $V$ represents the voltage in volts $(V)$
- $I$ represents the current in amperes $(A)$
By knowing the voltage and current in a circuit, we can determine the power consumption or dissipation.
In summary, Ohm’s law is a fundamental principle that governs the behavior of electrical circuits. It allows engineers and technicians to analyze, design, and troubleshoot electrical systems by understanding the relationships between voltage, current, and resistance.
Is Ohm’s law Universal?
Ohm’s law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points. In other words, the resistance of the conductor is constant. This law is fundamental to the understanding of electrical circuits and is used in a wide variety of applications.
However, Ohm’s law is not universal. There are some materials, called non-ohmic materials, that do not obey Ohm’s law. In these materials, the resistance changes with the voltage. This can be due to a number of factors, such as the temperature of the material or the presence of impurities.
One example of a non-ohmic material is a semiconductor. Semiconductors are materials that have a resistance that is somewhere between that of a conductor and an insulator. The resistance of a semiconductor decreases as the voltage increases. This is because the voltage causes the electrons in the semiconductor to move more freely, which allows more current to flow.
Another example of a non-ohmic material is a superconductor. Superconductors are materials that have no resistance at all. This means that they can conduct electricity with no loss of energy. Superconductors are used in a variety of applications, such as MRI machines and particle accelerators.
Ohm’s law is a very important law in the field of electricity, but it is important to remember that it is not universal. There are some materials that do not obey Ohm’s law, and these materials can be used in a variety of applications.
Why is Ohm’s law not applicable to semiconductors?
Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. In other words, the resistance of a conductor is constant. However, this law does not apply to semiconductors because their resistance is not constant.
The resistance of a semiconductor depends on a number of factors, including the temperature, the applied voltage, and the amount of impurities present. As the temperature of a semiconductor increases, its resistance decreases. This is because the increased thermal energy causes the electrons in the semiconductor to move more freely, making it easier for them to carry current.
The applied voltage also affects the resistance of a semiconductor. At low voltages, the resistance of a semiconductor is relatively high. This is because the electrons in the semiconductor are not able to overcome the potential barrier created by the impurities. However, as the applied voltage increases, the electrons are able to overcome the potential barrier and the resistance of the semiconductor decreases.
The amount of impurities present in a semiconductor also affects its resistance. The more impurities present, the higher the resistance of the semiconductor. This is because the impurities create defects in the semiconductor lattice, which makes it more difficult for the electrons to move freely.
Due to these factors, the resistance of a semiconductor is not constant and Ohm’s law does not apply. Instead, the relationship between current and voltage in a semiconductor is described by a more complex equation called the Shockley diode equation.
Here are some examples of how Ohm’s law does not apply to semiconductors:
- Light-emitting diodes (LEDs): LEDs are semiconductor devices that emit light when an electric current is passed through them. The resistance of an LED decreases as the applied voltage increases, which is why LEDs are able to produce light at different brightness levels.
- Transistors: Transistors are semiconductor devices that can be used to amplify or switch electronic signals. The resistance of a transistor depends on the amount of current flowing through it, which is why transistors can be used to control the flow of current in a circuit.
- Solar cells: Solar cells are semiconductor devices that convert light energy into electrical energy. The resistance of a solar cell decreases as the amount of light falling on it increases, which is why solar cells are able to produce more electricity on sunny days.
Ohm’s law is a fundamental law of electricity that applies to most conductors. However, it does not apply to semiconductors because their resistance is not constant. The relationship between current and voltage in a semiconductor is described by a more complex equation called the Shockley diode equation.
When does Ohm’s law fail?
Ohm’s law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, is a fundamental principle in electrical engineering. However, there are certain conditions under which Ohm’s law fails to hold true.
1. Non-Ohmic Materials: Ohm’s law is only applicable to materials that exhibit a linear relationship between current and voltage. Materials that do not follow this linear relationship are called non-ohmic materials. Examples of non-ohmic materials include semiconductors, diodes, and transistors. In these materials, the current-voltage relationship is non-linear, and Ohm’s law does not apply.
2. High Frequencies: At extremely high frequencies, the inductive and capacitive effects of a circuit become significant, and Ohm’s law may not accurately describe the circuit’s behavior. This is because the impedance of a circuit, which is the opposition to the flow of current, becomes frequency-dependent at high frequencies. As a result, the current and voltage may not be in phase, and the simple proportionality described by Ohm’s law no longer holds.
3. Non-Uniform Current Distribution: Ohm’s law assumes a uniform distribution of current throughout the conductor. However, in certain situations, such as when the conductor has an irregular shape or when there are non-uniformities in the material, the current distribution may not be uniform. In these cases, Ohm’s law may not accurately predict the current-voltage relationship.
4. Quantum Effects: At very small scales, such as in nanoscale devices or at extremely low temperatures, quantum effects become significant, and Ohm’s law may break down. Quantum mechanics introduces phenomena like quantum tunneling and the quantization of energy levels, which can significantly alter the current-voltage characteristics of materials.
5. Superconductivity: Superconductors are materials that exhibit zero electrical resistance below a certain critical temperature. In superconductors, Ohm’s law fails completely, as the current can flow without any voltage applied. This phenomenon is known as superconductivity and is a result of the formation of Cooper pairs, which are pairs of electrons that behave as bosons and can move through the material without encountering resistance.
In summary, Ohm’s law is a fundamental principle that describes the relationship between current and voltage in a conductor. However, it has certain limitations and may not hold true in cases involving non-ohmic materials, high frequencies, non-uniform current distribution, quantum effects, and superconductivity.