A variable resistor is connected to a constant voltage source.When the resistance is increased from 5.5 $\Omega$ to 9.3 $\Omega$,what happens to the power dissipated?
A) no change
B) a 35% decrease
C) a 41% decrease
D) a 59% decrease
E) a 69% decrease

Question

Quizplus · Accepted Answer

The power dissipated in a resistor connected to a constant voltage source is given by $ P = \frac{V^2}{R} $. When the resistance increases, the power decreases. Calculating the percentage decrease from 5.5 $\varOmega$ to 9.3 $\varOmega$, the power decreases by approximately 41%.

A Variable Resistor Is Connected to a Constant Voltage Source Ω\OmegaΩ

A Variable Resistor Is Connected to a Constant Voltage Source $\Omega$