Question

Power dissipated in the resistor is $P=$ ________.

• A. $VI$
• B. $I^{2}R$
• C. $\frac{V^2}{R}$
• D. Any of these

Answer 1

Answer: (D)

Power dissipated by a device that carries current $I$ when operated at a potential difference $V$ is given by

$P=VI$$

If the device has a resistance $R$ then we can use Ohm's law ($V=IR$)

So $P=\left(IR\right)I=I^{2}R$

or $P=V\left(\frac{V}{R}\right)=\frac{V^2}{R}$

So all the options are correct. Option (D) is the answer.