A vital part of any vehicle's electrical system, the alternator generates electricity for both the engine's ignition system and the vehicle's entire electrical system. Some of the engine's power is used to turn a set of electromagnets in the alternator, which, when passed by the wires inside the alternator, generates electricity. The amount of electricity made depends on the engine's speed and the size of both pulleys involved (the crankshaft pulley and alternator pulley).
The stator is a solid piece which stays stationary within the alternator. It has copper windings which direct the flow of electricity.