power dissipation

Question

Power dissipated in resistor is:

RankGuru · Accepted Answer

The power ($P$) dissipated as heat in a resistor follows Joule's law of heating:
$P = V \cdot I$
Substituting $V = IR$ (Ohm's Law):
$P = (IR) \cdot I = I^2 R$
Substituting $I = V/R$:
$P = V \cdot (V/R) = \frac{V^2}{R}$.

Rank Guru

power dissipation

Select the correct option:

More power dissipation Practice Questions

A 5 Ω resistor carries a current of 4 A. What is the power dissipated in the resistor?