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Question:

what is the difference between mechanical efficiency and electrical efficiency?

give formulas and explanation both

Answer:

The input, output and efficiency relationships are the same. In one case we are talking about a mechanical system and in the other it's an electrical system.
In general, mechanical efficiency is the ratio of the work input to the work output. There is always some frictional looses that require extra work input to overcome. Electrical efficiency is the ratio of power input to power output. There are always copper losses in any electrical equipment. These are basic differences and definitions. The basic formulas are efficiency output / input, using either work or watts. TexMav

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