A small signal voltage `V(t)=V_(0)sin omegat` is applied across an ideal capacitor `C`:

Options

A. Current `I(t)`, lags voltage `V(t)` by `90^(@)`
B. Over a full cycle the capacitor `C` does not consume any energy from the voltage source.
C. Current `I(t)` is in phase with voltage `V(t)`
D. Current `I(t)` leads voltage `V(t)` by `180^(@)`

Answer

B

Explanation

Power `=V_(rms). I_(rms) cos phi`
`as cos theta=0`(Because `phi=90^(@)`)
`:.` Power consumed `=0` (in one complete cycle)