Physics — AC RMS Values & Power
Root-mean-square voltage/current and average AC power.
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V_{rms} = \frac{V_0}{\sqrt{2}}, \quad I_{rms} = \frac{I_0}{\sqrt{2}}
P_{avg} = V_{rms} I_{rms}\cos\phi
\langle P \rangle = \tfrac{1}{2}V_0 I_0
\text{power factor} = \cos\phi