Which device transforms electrical energy to mechanical energy

A. generator

B. motor

C. transformer

D. magnet

The answer would be B. motor energy.

Examples of devices that convert electrical energy into mechanical energy - in other words, devices that use electrical energy to move something - include:

the motor in today’s standard power drills

the motor in today’s standard power saws

the motor in an electric tooth brushes

the engine of an electric car

the motor in a fan

the motor in a remote control cars that runs on batteries. So your answer would be B. Motorsport