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March 26, 2015

March 26, 2015

Posted by **Jessi** on Sunday, October 18, 2009 at 6:03pm.

(a) Find the current in the motor

(b) Find the energy delivered to the motor by electrical transmission in 3.30 h of operation

(c) If the electric company charges $0.160/kWh, what does it cost to run the motor for 3.30 h?

Ok so I started the problem by manipulating the power equation (P=IV) to get I=P/V and I got 10.2 A but it says that that's not correct. I assume the other parts aren't correct because I don't have part (a) right. What am I doing wrong. The power I used was 1.22kW

- Physics -
**bobpursley**, Sunday, October 18, 2009 at 6:17pmelectricalpower*.82=mechanicalpower

electrical power= 2hp(746watts/hp)/.82

IV= 2*746/.82

I= 2*746/(.82*120)

I get about 15 amps

- Physics -
**Jessi**, Sunday, October 18, 2009 at 6:26pmthanks! i was multiplying by 0.82 instead of dividing

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