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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.
The generator is what actually produces electricity. A turbine is used to turn the generator. A turbine is able to take high pressure, high temperature steam moving through â¦ it, and extract energy to cause the turbine to rotate. This is attached to the generator, which generates electricity as it rotates.