For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P = I^(2) Z cos phi`.A. the power factor `cos phi ge 0, P ge 0`B. the driving force can give no energy to the oscillator(P = 0) in some cases.C. the driving force cannot syphon out `(P lt 0)` the energy out of oscillator.D. all of these.

For an LCR circuit, the power transferred from the driving source to t

1.	For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P = I^(2) Z cos phi`.A. the power factor `cos phi ge 0, P ge 0`B. the driving force can give no energy to the oscillator(P = 0) in some cases.C. the driving force cannot syphon out `(P lt 0)` the energy out of oscillator.D. all of these.
Answer» Correct Answer - D Here, `P = I^(2)Z cos phi` (a) If power factor `cos phi ge 0 rArr P ge0` (b) For wattless component the driving force shall give no energy to the oscillator, so, at `phi = 90^(@), P = 0`. (c ) The driving force cannot syphon out the energy out of oscillator. i.e. P cannot be negative. Hence all options are correct.

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