New answers tagged power
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$$\begin{align}
p &= V(t)\ I(t) \\
p &= V_m \sin(\omega t) \ I_m \sin(\omega t + \phi) \\
p &= V_m I_m\ \sin(\omega t) \ \sin(\omega t + \phi) \\
\end{align}$$
Trigonometric identity:
$$ \sin \alpha \ \sin \beta = \frac {\cos(\alpha - \beta) - \cos(\alpha + \beta)}{2} $$
$$\begin{align}
p &= \frac {P_m} {2}\ [{ \cos(\omega t - \omega t - \...
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