Define the terms (I) resonant frequency, and (II) power factor of a series LCR circuit. For what value of the power factor will the power dissipated in the circuit be maximum?
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In LCR circuits:
\[
Z=\sqrt{R^2+(X_L-X_C)^2}
\]
At resonance:
\[
X_L=X_C,\quad Z=R,\quad \cos\phi=1
\]