what is the difference between an Ac and DC motor?
An AC motor uses an alternating current power source, meaning that the direction of current through the coil changes every half turn, maintaining the direction of torque produced by the magnetic field. A DC motor uses a direct current power source, and is set up so that after every half turn, its coil's contacts switch directions, so that the direction of the torque produced by the magnetic field remains constant by using a commutator.
