When the voltage across a resistor is decreased by 50%,what happens to the power dissipated?
A) it increases by 50%
B) it decreases by 50%
C) it decreases by 25%
D) it decreases by 71%
E) it decreases by 75%

Question

Quizplus · Accepted Answer

The power dissipated in a resistor is given by P = V^2/R. If the voltage is decreased by 50%, the new voltage is 0.5V. The new power is (0.5V)^2/R = 0.25V^2/R, which is 25% of the original power, meaning it decreases by 75%.

When the Voltage Across a Resistor Is Decreased by 50%,what