If we double the resistance in a circuit but keep the current in it constant,the power dissipated by that circuit will
A)be four times as great.
B)be two times as great.
C)be one-half as great.
D)be one-fourth as great.

Question

Quizplus · Accepted Answer

The power dissipated in a circuit is given by P = I^2R, where P is power, I is current, and R is resistance. If the resistance is doubled (R becomes 2R) while keeping the current constant, the new power dissipated becomes P' = I^2(2R) = 2I^2R, which is twice the original power.

If We Double the Resistance in a Circuit but Keep