A D.C. generator can be considered as

Answer: Option C

A D.C. generator can be considered as a rotating amplifier because it converts mechanical energy into electrical energy by electromagnetic induction.

The generated voltage is proportional to the speed of rotation and the magnetic flux, thereby amplifying the mechanical input into an electrical output.

This amplification property is why it is often compared to an amplifier in the electrical domain.

Other options, such as rectifier, prime mover, and power pump, do not match the fundamental operation of a D.C. generator.

Rectifier: Converts AC to DC, not applicable here.

Prime mover: Provides mechanical energy to drive the generator but is not the generator itself.

Power pump: Refers to fluid systems and is unrelated to D.C. generators.

Thus, the correct analogy for a D.C. generator is a rotating amplifier.