Alternator

Alternator 
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As the engine starts, the drive belt causes the pulley of the alternator to rotate.
As a result, the rotor rotates, and an electric current emits in the coil of the stator. 

1-Pulley
2- Rotor (Coil)
3- Stator (Coil)
4- Rectifier (diodes)
5- IC regulator
6- Terminal "B