送交者: HunHunSheng 于 2005-10-13, 16:43:53:
回答: electric motor's efficiency, defined it, 1st, please. 由 无知 于 2005-10-13, 16:39:34:
To move a car from point A to point B, the output
work is fixed. If a motor is efficient, then
it use less input enegry (gas or electric)