A 200-Ω resistor is rated at 1/4 W.What is the maximum voltage that can safely be connected across it?
A)0.71 V
B)7.1 V
C)50 V
D)0.25 V

Question

Quizplus · Accepted Answer

The maximum power rating of the resistor is 1/4 W or 0.25 W. Using the power formula P = V^2/R, where P is power, V is voltage, and R is resistance, we can solve for V: V = sqrt(P*R) = sqrt(0.25W * 200Ω) = sqrt(50) = 7.07 V, which is approximately 7.1 V.

A 200-Ω Resistor Is Rated at 1/4 W