Which devices convert electrical energy into mechanical energy?

The device that converts electrical energy into mechanical energy is the electric motor. This process occurs within an electric motor where electric current flows through coils of wire, producing magnetic fields that interact with permanent magnets or other electromagnets. As a result, the rotor (the rotating part of the motor) experiences a force and starts to turn, thus transforming electrical energy into kinetic energy or mechanical motion.

For clarity, generators work in the opposite direction; they convert mechanical energy into electrical energy. Batteries store electrical energy but do not convert it into mechanical energy. Transformers are used to step up or step down voltage levels in AC circuits, and they do not perform energy conversion in the form of motion. The distinct characteristic of electric motors is their primary function of facilitating mechanical work, making them the correct answer in this context.