Question

If the current through a resistor is 12 A and the voltage drop is 12 V, what is the power absorbed by the resistor? Answer to the nearest 1 W. Assume the power equation is positive.

Answer 1

Answer:

144 W

Explanation:

The power absorbed by a resistor is the product of the current passing through it and the voltage drop across it. Hence

$P=IV$

$P=12\text{ A}\times12\text{ V}=144 \text{ W}$

Other variations of this formula are derived using Ohm's law, $V=IR$

$P=I^2R=\dfrac{V^2}{R}$

$R$ is the resistance of the resistor. It is what causes the voltage drop.