An iPod uses 3.7 volts with direct current of 865 milliamps. What is the equivalent resistance of the entire iPod system?
A) 4.3 ohms
B) 1 ohm
C) 3200 ohms
D) 8.4 ohms

Question

Quizplus · Accepted Answer

The equivalent resistance can be calculated using Ohm's law, $V = IR$, where $V$ is the voltage, $I$ is the current, and $R$ is the resistance. Rearranging for resistance gives $R = \frac{V}{I}$. Substituting the given values, $R = \frac{3.7V}{865mA} = \frac{3.7V}{0.865A} \approx 4.3 \, \text{ohms}$.

An IPod Uses 3