Final answer:
The frequency of an alternator is dependent on the frequency of rotation of the coils in an electrical generator.
Step-by-step explanation:
In an electrical generator, the frequency of rotation of the coils determines the frequency of the alternating current (AC) output.
The AC voltage produced by the generator is directly proportional to the rate of change of magnetic flux with respect to distance.
When the frequency of rotation of the coils is increased, the rate of change of magnetic flux also increases, resulting in a higher output emf (electromotive force) or voltage.
For example, if the frequency of rotation is doubled, the output emf will also double.