Question

If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:

Options

• 100%

• 200%

• 300%

• 400%

Answer 1

300%

Explanation:

Let the original value of current be I amp. 

The new value of current, I' = I + 100% I = 2I

New power P' = I'² R = 4I² R = 4P

Change in power = P' − P = 3P

Change in power in terms of percentage is 300%.