Section: STEM · PhysicsDifficulty: Medium

Electromagnetic Induction

USUK

A changing magnetic field induces an electric current in a conductor.

Also: Faraday's induction

Definition

Electromagnetic induction is the process by which a changing magnetic field within a closed loop of conductor generates an electromotive force (EMF) and thus an electric current. Discovered by Michael Faraday in 1831, this principle is quantified by Faraday's Law and is the operating principle behind electric generators, transformers, and inductors.

Example

“In a power plant, turbines spin large coils of wire inside magnetic fields, continuously changing the magnetic flux and generating the alternating current that powers homes and businesses.”

Synonyms

  • Faraday induction
  • magnetic induction
  • electromagnetic generation

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Related Terms

  • Faraday's Law
  • Magnetic Flux
  • Electric Generator
  • Lenz's Law

Dictionary Entry

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