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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.
A generator is the opposite of a motor â it transforms mechanical energy into electrical energy. This is an ac generator: The axle is rotated by an Electric Generators Copyright Â© 2009 Pearson Education, Inc. external force such as falling water or steam.