If it takes you 5 minutes to dry your hair using a 1200-W hair dryer plugged into a 120-V power outlet, how many coulombs of charge pass through your hair dryer?

Question

Quizplus · Accepted Answer

The power (P) is 1200 W and the voltage (V) is 120 V. Using the formula P = IV, where I is the current, we find I = P/V = 1200 W / 120 V = 10 A. The time (t) is 5 minutes, which is 300 seconds. The charge (Q) is given by Q = It = 10 A * 300 s = 3000 C.

If It Takes You 5 Minutes to Dry Your Hair