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Module 17 in the Syllabus

Electromagnetic Induction Cards
Chapter from the Wisebridge Learning System for Physics

Electomagnetic Induction Images
Image gallery for study with links to larger teaching JPEGs for classroom presentation

Question Drill for Electomagnetic Induction
Conceptual Vocabulary Self-Test

Basic Terms Crossword Puzzle

Basic Puzzle Solution

Conceptual Vocabulary
Electromagnetic inductionElectromagnetic induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field.
Faraday's law of inductionFaraday's law of induction states that the induced EMF in a closed loop equals the negative of the time rate of change of magnetic flux through the loop.
Lenz's lawLenz's law states that induced EMF opposes the change in flux producing it.
Electromotive forceElectromotive force or potential of a body is the work done in joules to bring a unit electric charge from infinity to the body.
Magnetic fluxMagnetic flux is a measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field.
Electric motorAn electric motor converts electrical energy into mechanical energy.
Electrical generatorAn electrical generator is a device that converts kinetic energy to electrical energy, generally using electromagnetic induction.
Counter-electromotive forceThe counter-electromotive force is the voltage, or electromotive force, that pushes against the current which induces it.
RL circuitA resistor-inductor circuit, an RL circuit, consists of a resistor and an inductor, either in series or in parallel, driven by a voltage source.
LC circuitAn LC circuit consists of an inductor and a capacitor.
Eddy currentAn eddy current is caused when a moving or changing magnetic field intersects a conductor, or vice-versa, causing a circulating current within the conductor.
Transformer effectThe transformer effect is a process by which an EMF is induced in which a changing electric current in a primary coil creates a changing magnetic field that induces a current in a secondary coil.
HenryThe henry is the SI unit of inductance.
WeberThe weber is the SI unit of magnetic flux.
CommutatorA commutator is an electrical switch that periodically reverses the current in an electric motor or electrical generator.
ArmatureAn armature is a conductor or a conductive coil in a motor or generator, oriented normal to both the field and to the direction of motion.
Induction heatingInduction heating is the process of heating a metal object by induced eddy currents generated within the metal.
Hall effectThe Hall effect refers to the potential difference on the opposite sides of an electrical conductor through which an electric current is flowing created by a magnetic field applied perpendicular to the current.
Antenna factorThe antenna factor is defined as the ratio of the incident electromagnetic field to the output voltage from an antenna.
Eddy current brakeUnlike friction brakes, which apply pressure on two separate objects, eddy current brakes slow an object by creating electrical currents through electromagnetic induction which creates resistance.
Kinetic inductanceObserved in superconductors, and at high frequencies, kinetic inductance is the manifestation of the inertial mass of mobile charge carriers in alternating electric fields as an equivalent series inductance.
Advanced terms that may appear in context in MCAT passages
Larmor formulaThe Larmor formula is used to calculate the total power radiated by a nonrelativistic point charge as it accelerates.
Ponderomotive forceA ponderomotive force is a nonlinear force that a charged particle experiences in a rapidly oscillating, inhomogeneous electric or electromagnetic field.
Poynting's theoremPoynting's theorem is a statement about the conservation of energy for the electromagnetic field relating the time derivative of the energy density to the energy flow and the rate at which the fields do work.
Homopolar generatorA homopolar generator, is a DC electrical generator in which the magnetic field has the same polarity at every point, so that the armature passes through the magnetic field lines of force continually in the same direction.
Armature reaction dropArmature reaction drop is the effect of a magnetic field on the distribution of the flux under main poles of a generator.
StatorThe stator is the stationary part of an electric motor or alternator.

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