What device converts electrical energy into mechanical energy?

The device that converts electrical energy into mechanical energy is indeed a motor. Motors operate based on the principle of electromagnetism, which allows them to create motion when an electric current passes through their windings, generating a magnetic field that interacts with permanent magnets or other parts of the motor. This interaction causes the rotor to turn, transforming the electrical energy supplied into useful mechanical work, such as turning a fan blade or driving a conveyor belt.

Understanding the function of a motor is essential in electrical systems where mechanical movement is required, such as in automotive applications, industrial machinery, and household appliances. The other options listed do not serve this function: a generator converts mechanical energy into electrical energy, a transformer changes voltage levels without converting energy types, and a capacitor stores electrical energy temporarily.