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

Ans: Option B - ${\mathrm{IR}}^2$

The rate of doing work is power. This is also the rate of consumption of energy.

The power P is given by

                                              $\mathrm{P} = \mathrm{VI}$

or 

                                         $\mathrm{P}={\mathrm{I}}^2\mathrm{R}=\raisebox{1ex}{${\mathrm{V}}^2$}\!\left/ \!\raisebox{-1ex}{$\mathrm{R}$}\right.$

The SI unit of electric power is watt (W). It is the power consumed by a device that carries 1 A of current when operated at a potential difference of 1 V. Thus,

                            $1 \mathrm{W} = 1 \mathrm{volt} \times 1 \mathrm{ampere} = 1 \mathrm{V} \mathrm{A}$

Therefore, ${\mathrm{IR}}^2$ is not an equation for power.