Generators

If the simple rotor of a DC motor to rotate manually, the engine will run as a generator. In the coil an alternating voltage, which reaches a peak value when its poles are the poles of the permanent magnet. Then the voltage drops to zero and reverses its direction, reaching a maximum when poles of the coil are opposite poles of the permanent magnet. You can connect to a coil, connecting the ends of two solid copper rings ( slip rings) included in the axis of the rotor. Carbon brushes RUB against the rings and remove the AC voltage, whereby when connected to an electrical circuit an alternating current. This generator refers to the generator of alternating current, that is electric cars, which produce alternating current.