Electromagnetism: Mutual & Self-Induction 2

Question	Answer
Mutual Induction	A changing magnetic field in one coil induces an emf in another coil
Transformer	An electrical device used to change the voltage of AC power supplies
Components of a transformer	A secondary coil wrapped around a primary coil, which is wrapped around a transformer core
Formula for voltage of transformers	Vi/Vo = Np/ Ns
Uses of transformers	Mobile phone chargers; Televisions; Computers; Power stations
Self-Induction	When a changing magnetic field in a coil induces an emf in the coil itself
Inductor	A device used to induce a back emf
Function of inductors	Reduce the current flowing in an AC circuit
Components of an inductor	Coil of wire with a number of turns, wrapped around a soft iron core
Uses of inductors	Dimmer switches; Radios

Resource summary

	Created by alex.examtime9373 almost 13 years ago

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