does an alternator charge a battery
When the battery supplies electricity, exactly the opposite happens: the extra lead dissolves off the plates in a reaction that produces an electric current. The battery is charged by an alternator on modern cars, or by a dynamo on earlier ones. Both are types of generator, and are driven by a belt from the engine. The alternator consists of a stator - a stationary set of wire coil windings, inside which a rotor revolves.