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**1. Homework Statement**

Here's another motor--this one operates on 54 V and does work at a rate of 140 W. How much resistance must be connected in series to this motor, if you wish to plug it in to a 120 V outlet?

**2. Homework Equations**

I'm not sure, but:

P = (V^2)/R

Where P is power, V is voltage, and R is resistance.

**3. The Attempt at a Solution**

Am I supposed to subtract the motor voltage from the outlet voltage?

((120-54)^2)/140 = 31.114 ohm

I know that this is wrong...