AC Generator

Principle :
A.C. generators or alternators (as they are usually called) operate on the same fundamental principles of electromagnetic induction as D.C. generators.
Alternating voltage may be generated by rotating a coil in the magnetic field or by rotating a magnetic field within a stationary coil. The value of the voltage generated depends on
*The number of turns in the coil.
*Strength of the field.
*The speed at which the coil or magnetic field rotates.