How is an electric generator different from an electric motor?

The fundamental difference between an electric generator and an electric motor lies in the direction of energy conversion:

• Electric Generator: This machine converts mechanical energy into electricity. It typically utilizes a rotating shaft driven by a prime mover—such as a turbine or engine—to produce electrical power for distribution.1
• Electric Motor: This device performs the inverse function, converting electrical energy into mechanical energy. Most motors operate by using electromagnetic phenomena, where conductors carrying current interact with a magnetic field to generate mechanical torque.2

While both machines rely on electromagnetic principles, they serve opposite purposes in a system. A motor generator set may combine both devices to convert electric power from one form to another, such as changing alternating current to direct current.3