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An electric motor is an electromechanical device that converts electrical energy into mechanical energy.

The interaction between an electric motor's magnetic field and winding currents generates force and is useful in the motor. The reverse process, producing electrical energy from mechanical energy, is done by generators such as an alternator or a dynamo; some electric motors can also be used as generators, for example, a traction motor on a vehicle may perform both tasks. Electric machines are traditionally understood to include transformers as well as electric motors and generators.