Question

A space heater is connected to a standard 120 volt line. If the resistance of the operating

heater is 12 ohms, what power does the heater use? (NOTE: you'll have to use both Ohm's
Law and the Power Equation.)

A) 1200 W

B) 0.10 W

C) 10 W

D) 1440 W

Answer 1

A) 1200 W

Step-by-step explanation:

First find I (current):

V = IR, so I = V/R

I = 120V/12Ω = 10 A

Now find P (power):

P = VI = (120V)(10A) = 1200 W