An AC generator works on the principle of :

The correct answer is 'electromagnetic induction'.

Key Points

• AC generators work on the principle of Faraday’s law of electromagnetic induction, which states that electromotive force – EMF or voltage – is generated in a current-carrying conductor that cuts a uniform magnetic field.
• This can either be achieved by rotating a conducting coil in a static magnetic field or rotating the magnetic field containing the stationary conductor.
• The preferred arrangement is to keep the coil stationary because it is easier to draw induced alternating current from a stationary armature coil than from a rotating coil.
• The generated EMF depends on the number of armature coil turns, magnetic field strength, and the speed of the rotating field.

Additional InformationAC generator:

• AC generator is a machine that converts mechanical energy into electrical energy.
• The AC Generator’s input supply is mechanical energy supplied by steam turbines, gas turbines and combustion engines.
• The output is alternating electrical power in the form of alternating voltage and current.