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Alternator has DC field which generates constant magnetic field in Armature. Generator has permanent magnet which generates constant magnetic field in stator. 12. In alternator we take supply from its stator. In generator we take supply from rotor. It is a major difference between alternator and generator.
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.