Hydraulic-Electric Analogies: Transmission Comparisons, Part 3 (.PDF Download)

Continuing with the analogy that a pump is to the hydraulic circuit what a generator is to an electric circuit, the ideal generator is likewise 100% efficient. A real generator has two sources of internal losses. First, some amount of resistance always exists in the windings that make up the armature and field because they consist of wire, which has resistance. Second, inevitable friction and windage losses occur that accompany any part in motion...

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