Answer
144 $\Omega$
Work Step by Step
Power (P), Voltage (V) and Resistance (R) are connected together by the formula,
P=$\frac{V^{2}}{R}$
As laid out in the question, P=100 W and V = 120 V
Rearranging the formula to make R the subject of the formula,
R=$\frac{V^{2}}{P}$
After substituting the values of P and V, R is found to be 144 $\Omega$
