Electromagnetic induction

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Electromagnetic induction - the phenomenon of electromotive force in the conductor due to changes in magnetic field flux. This change may be due to changes in the magnetic field or relative motion of the conductor and the source of the magnetic field. This phenomenon was discovered in 1831 by English physicist Michael Faraday.

The induction phenomenon is described by Faraday's electromagnetic induction law: E = & # x2212; d & # x03A6; B d t {\displaystyle {\mathcal {E}}=-{{d\Phi _{B}} \over dt}} ,

where: E {\displaystyle {\mathcal {E}}} is the induced electromotive force (SEM) in volts; ΦB is a stream of magnetic induction flowing through the guided surface.

The change of magnetic flux may be due to conductor motion or magnetic field source. If it is rotary, the SEM generated in this way is called the electromotive force of rotation. SEM produced by static conductors as a result of changes in magnetic induction (usually caused by change in current) is called electromotive force of transformation.

Faraday's law has become one of Maxwell's equations.

Electromagnetic induction is currently the primary method of producing electricity and the basis of many electrical devices such as generators, alternators, generators in power plants, transformers, induction furnaces, induction motors and inductors, coils and electromagnetic heads.

In order to determine the direction of the induced current, electromagnetic induction uses the Lenz rule, called the reciprocal rule, which reads: The electromotive force of induction is such that it counteracts the cause that led to it. Authoritative control (physical phenomenon):

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