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July 24, 2014

Homework Help: physics

Posted by julie on Monday, March 14, 2011 at 7:02pm.

A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp.
(a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h?
(b) What is the efficiency of the motor?

for (a) i am doing IV*hours*price and its coming up worng.
and for (b) i changed .2hp into Watts. and i got 149.2W.

im just not sure how to do this problem.

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