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1 一3kW之直流發電機,於滿載運轉時,總損失為1000W,則此時運轉效率為 100 統測
A 90%
B 85%
C 75%
D 70%

Po=3kW

Pi = 3000+1000=4000W

η=3000/4000=0.75=75%