# Which of the following terms does not represent electrical power in a circuit ?

Question.
Which of the following terms does not represent electrical power in a circuit ?

(1) $I^{2} R$

(2) $\mathrm{IR}^{2}$

(3) VI

(4) $\mathrm{V}^{2} / \mathrm{R}$

solution:

Electrical power, $\mathrm{P}=\mathrm{VI}=(\mathrm{IR}) \mathrm{I}=\mathrm{I}^{2} \mathrm{R}$

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

Obviously, $\mathrm{IR}^{2}$ does not represent electrical power in a circuit.

Thus, (2) is the correct answer.