The instantaneous power loss in a circuit containing only a resistor through which DC current flows is given by the formula P = I² R. To retain the form of this equation for the case of AC current, it is enough to A) interpret P as average power. B) interpret I as rms current. C) The first two answers are valid and sufficient. D) Both of the first two answers are necessary, but they are not sufficient.

Question

Quizplus · Accepted Answer

For AC circuits, interpreting P as the average power and I as the rms (root mean square) current allows the formula P = I^2R to accurately represent the power loss in a resistor, making both adjustments valid and sufficient.

The Instantaneous Power Loss in a Circuit Containing Only a Resistor