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For an \( L C R \) circuit, the power transferred from the driving source to the driven oscillator is \( P=I^{2} Z \cos \phi \).
\( \mathrm{P} \)
W Then
(a) the power factor \( \cos \phi \geq 0, P \geq 0 \).
(b) the driving force can give no energy to the oscillator \( (P=0) \) in some cases.
(c) the driving force cannot siphon out \( (P0) \) the energy out of oscillator.
(d) all of these.
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