6m 14s | 232173 view | 1143 rating

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.