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## Homework Statement

A potential difference V is connected across a device with resistance R, causing current i through the device. Rank the following variations according to the change in the rate at which electrical energy is converted to thermal energy due to the resistance, greatest change first:

(a) V is doubled with R unchanged,

(b) i is doubled with R unchanged,

(c) R is doubled with V unchanged,

(d) R is doubled with i unchanged.

## Homework Equations

$$P= {i^2} R$$

$$P= \frac {V^2} R$$

## The Attempt at a Solution

I know and understand that (a) and (b) result in ##P'=4P##, but I'm not sure if I judge (c) and (d) variations correctly. I guess that the answer to (c) and (d) is that there would be no change if the device obeys Ohm's law.