If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) decrease to one-fourth of what it was.
B) decrease to one-half of what it was.
C) quadruple in magnitude.
D) double in magnitude.

Question

Quizplus · Accepted Answer

The power dissipated in a circuit is given by P = I^2 * R, where P is power, I is current, and R is resistance. If the current is doubled, the power will increase by a factor of 2^2 = 4, hence quadrupling in magnitude.

If the Current Flowing Through a Circuit of Constant Resistance