Question

Calculate the power being consumed by a 100Ω resistive element connected across a 240V

supply.

Answer 1

Let's first find the current flowing through the resistive element from the Ohm's Law:

$$I=\dfrac{V}{R}=\dfrac{240\ V}{100\ \Omega}=2.4\ A.$$

Finally, we can find the power being consumed by a 100Ω resistive element:

$$P=I^2R=(2.4\ A)^2\cdot100\ \Omega=576\ W.$$