Which has the larger resistance,a 60-W or a 100-W incandescent lamp,both rated for 120-V operation?
A)60-W lamp
B)100-W lamp
C)both the same

Question

Quizplus · Accepted Answer

The resistance of a lamp can be calculated using the formula $R = \frac{V^2}{P}$, where $V$ is the voltage and $P$ is the power. For a 120-V operation, the 60-W lamp has a resistance of $R = \frac{120^2}{60} = 240 \, \Omega$, and the 100-W lamp has a resistance of $R = \frac{120^2}{100} = 144 \, \Omega$. Therefore, the 60-W lamp has a larger resistance.

Which Has the Larger Resistance,a 60-W or a 100-W Incandescent