The engine burns the gas which causes the engine to spin. That spinning motion is used to drive several things, one of which is the alternator.
An alternator is a metal case that contains a bunch of copper windings and a spinning axle that carries some magnets. If you move a magnet with a coil of wire or move the coil of wire over the magnet, you generate an electrical current. In a car, this is used to run your electrical accessories and charge your battery.
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