An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding $14 \mathrm {~W}$ What is the safe current through the component?
A)0.91 A
B)1.21 A
C)238 A
D)0.22 A

Question

Quizplus · Accepted Answer

The safe current can be calculated using the power formula $P = I^2R$, where $P$ is the power in watts, $I$ is the current in amperes, and $R$ is the resistance in ohms. Rearranging the formula to solve for $I$ gives $I = \sqrt{\frac{P}{R}}$. Substituting $P = 14 \, \text{W}$ and $R = 17 \, \Omega$ yields $I = \sqrt{\frac{14}{17}} \approx 0.91 \, \text{A}$.

An Electronic Component with a 17-Ω Resistor Is Rated for Use