Which of the following equations correctly represents the power dissipated in a resistor of resistance $R$ through which a current $I$ flows?

Step-by-step solution

1. Recall the expression for power dissipated by a resistor: $P=I^{2}R$.
2. Verify each option against this expression.
3. Option A matches the correct formula.
4. Options B, C, and D are incorrect rearrangements.
5. Thus the correct answer is option A.

Concept tested: Power dissipation in resistors

Published 10 September 2026 · How this solution was prepared and checked