For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P = I^(2) Z cos phi`.

Options

A. Hence, the power factor `cosphi gt- 0, P gt-0`
B. The driving force can give no energy to the oscillator (P=0) in some cases.
C. the driving force cannot syphon out`(Plt0)` the energy out of oscillator
D. The driving force can take away energy out of the oscillator.

Answer

A, B, C

Explanation

According to the question, power transferred,
`P=I^(2)Zcosphi`
Where I is the current, Z= impedance and `cosphi` is power factor.
As power factor, `cosphi=R/Z`
where, `Rgt0` and `Zgt0`
`rArr cosphigt0 rArr Pgt0`