Question

What happens to the power dissipated in the resistor when the resistance is quadrupled and the voltage remains constant?

• A. It is doubled
• B. It is quadrupled
• C. It is halved
• D. It is quartered
• E. It remains the sam

Answer 1

The correct option is D It is quartered

Power dissipated in a resistor is $P=\frac{V^2}{R}$

As voltage V remains constant so $P\propto \frac{1}{R}$

Thus, when $R=4R$, the power will be $P/4$ means it will quater of initial.