An electrical generator generates electrical energy. It takes some kind of mechanical energy to turn the generator. The generator is said to convert mechanical energy into electrical energy.

A Generator is electrical machine which produces electrical current and voltage..

A generator changes mechanical energy into electrical energy.

Generator can transform mechanical energy into electrical energy by converting the rotational motion of its turbine into electrical current through electromagnetic induction.

Generator uses kinetic energy and produces electrical energy. Hence, energy is transformed in generator.