Physics - EMI/AC Question with Solution | TestHub

Key Idea: The power is defined as the rate at which work is being done in the circuit. Power $=$ rate of work done in one complete cycle. $\begin{array}{rl}& P_{a\nu }=\frac{W}{T}\\ & P_{a\nu }=\frac{\left(E_0{I}_0\cos \varphi \right)T/2}{T}\\ & P_{a\nu }=\frac{E_0{I}_0\cos \varphi }{2}\end{array}$ where $\cos \varphi$ is called the power factor of an AC circuit.