Which device is used to convert electrical energy into mechanical energy?

An electric motor is designed specifically to convert electrical energy into mechanical energy. This process occurs through electromagnetic principles, where an electric current passes through a coil, creating a magnetic field that interacts with permanent magnets or other electromagnets in the motor. This interaction generates rotational motion, which can then be harnessed to perform work, such as turning a fan blade, rotating a mechanical gear, or driving a pump.

Transformers, on the other hand, are devices that alter the voltage of alternating current electrical energy without converting it into mechanical energy. Generators serve a different purpose by converting mechanical energy into electrical energy, often using mechanical movement to produce electricity. A switch is simply a control device that interrupts or connects electrical current but does not convert energy forms. Thus, the applicability of the electric motor in the context of converting electrical energy to mechanical energy makes it the correct choice.