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Alternators and generators are two devices which generate electricity. An alternator can be called a type of generator. Although both these devices serve the same function, they are quite different in every other aspect. An alternator is a charging system for cars that produces electricity. Generators are used in the production of large-scale electricity. Both alternators and generators convert mechanical energy into electrical energy. The main difference between them is in regard to what spins and what is fixed.
Generator-normally this term is used to describe an alternator which creates AC power using electromagnetism. Generators, Dynamos, and Batteries are the three tools necessary to create/store substantial amounts of electricity for human use. Batteries may have been discovered as early as 248 BC.