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The alternator in a motor vehicle is used as a generator and supplies, with the engine running, all electrical devices and recharges at the same time the starter battery. A generator converts mechanical energy into electrical energy and thus provides all the electrical components of a motor vehicle. In general, the generator is coupled to the V-ribbed or V-belt and thus receives the necessary friction to generate electric energy. In exceptional cases, it is also linked to the crankshaft so a combination of the alternator creates together with the starter.