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

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 (I) is doubled, the power dissipated becomes (2I)^2 * R = 4I^2 * R, which is four times the original power, hence quadrupling in magnitude.

If the Current Flowing Through a Circuit of Constant Resistance