Question

An ac generator `G` with an adjustable frequency of oscillation is used in the circuit, as shown.

If the ac source `G` is `100 V` rating at resonant frequency of the circuit, then average power supplied by the source is
A. `50 W`
B. `100 W`
C. `500 W`
D. `1000 W`

Answer 1

Correct Answer - B
At resonance `i_("rms") = (100)/(100) = 1A`
Power supplied `= V_("rms") I_("rms") cos phi`
`(phi = 0` at resonance), `P = 100 W`