physics

A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% efficient in converting power that it takes in by electrical transmission into mechanical power.
(a) Find the current in the motor.

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1. Po = 2.20hp * 746w./hp = 1641.2 Watts

Pi = Po/0.92 = 1641.2/0.92 = 1784 Watts

Pi = 120*I = 1784 W.
I = 1784/120 = 14.9A.

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posted by Henry

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