1.

For an LCR circuit, the power transferred from the driving source to the driven oscillator is P=I^2Zcosphi _____

Answer»

Here, the POWER factor cos `PHI gt 0 , P gt 0`
The driving force can give no energy to the oscillator (P = 0) in some cases.
The driving force cannot SYPHON out (P `lt` 0) the energy out of oscillator.
The driving force can take AWAY energy out of the oscillator.

Solution :Power `P=I^2Z cos phi`
where I=current , Z=impedance , cos `phi`=power factor
but cos `phi=R/2`
where R `gt` 0 and HENCE `Z gt 0`
`therefore cos phi gt 0`


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