A resistor of resistance $8\Omega$ carries a current of $0.5\text{A}$. Calculate the potential difference across the resistor.

Step-by-step solution

1. Use Ohm\'s law $V=IR$ because the voltage across a resistor equals the product of current and resistance.
2. Substitute $I=0.5\text{A}$ and $R=8\Omega$: $V=0.5\times 8$.
3. Calculate $V=4$, so the potential difference is $4\text{V}$.

Concept tested: Ohm's law (V = I R)

Published 25 August 2026 · How this solution was prepared and checked

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