What is the required input in watts to operate a 70% efficient 3 horsepower electric motor?
A) 3 HP × 746 watts/HP = 2228 watts work done input is the same as work done
B) 3 HP × 746 watts/HP = 2228 watts work done 2228 watts × 0.7 = 1560- watts input
C) 3 HP × 746 watts/HP = 2228 watts work done 2228 watts work done / 0.7 = 3183 watts input
D) The input power cannot be determined without knowing the voltage.
C
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