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

A 120-V motor has mechanical power output of 2.00 hp. It is 82.0% efficient in converting power that it takes in by electrical transmission into mechanical power.

(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

## Answer This Question

## Related Questions

- physics - A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% ...
- physics - A 120-V motor has mechanical power output of 3.20 hp. It is 81.0% ...
- physics - A 120-V motor has mechanical power output of 3.00 hp. It is 94.0% ...
- physics - A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% ...
- physics - A 120-V motor has mechanical power output of 3.00 hp. It is 94.0% ...
- algebra - The power (P) required to run a motor is equal to the voltage (E) ...
- physics - The electrical motor runs on a D.C source of emf E and internal ...
- Physics - Searches related to a motor lifts an elevator of mass m at constant ...
- Physics - A motor lifts an elevator of mass m at constant speed. The power ...
- physics - A small motor draws a current of 1.76 A from a 110 V line. The output ...

More Related Questions