Transformer effect
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The transformer effect is one of the processes by which an electromotive force (e.m.f.) is induced. In the transformer effect, electromotive force is induced in a stationary circuit by a changing magnetic field. In a transformer, a changing electric current in a primary coil creates the changing magnetic field that induces a current in a secondary coil.
This process is one of two ways in which electromagnetic fields can induce an electromotive force. The other is the generator effect (motional emf), which relies on a conductor moving in a static magnetic field, leading to a rate of change of flux, dΦ/dt.
Both effects can be explained further by Faraday's law of electromagnetic induction. The sign of the induced current is given by Lenz's Law.
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