Friday, November 21, 2008

Electromagnetic Induction

Electromagnetic induction is the production of an electromotive force (emf) either by motion of a conductor through a magnetic field so as to cut across the magnetic flux or changing magnetic field about the conductor. The process by which an emf is induced in one circuit by a change of current in a neighboring circuit is called mutual induction.

That effect was first observed in 1831 by English physicist Michael Faraday (1791–1867) and shortly thereafter by American physicist Joseph Henry (1797–1878). Electromagnetic induction is an incredibly useful phenomenon with a wide variety of applications. Induction is used in power generation and power transmission.