In an a.c circuit, value of voltage and current change every instant. Therefore, power of an a.c. circuit at any instant is the product of instantaneous voltages `(E)` and instantaneous current `(I)`. The average power supplied to a pure resistance `R` over a complete cycle of a.c is `P = E_(upsilon). I_(upsilon)`. When circuit is inductive, average power/cycle `= E_(upsilon) I_(upsilon) cos phi`, where `phi` is the phase angle between alternating voltage an altenating current in the circuit. In an a.c. circuit, `800 mH` inductor and a `60 mu F` capacitor are connected in series with `15 ohm` resistance. The a.c. supply to the circuit is `230 V, 50 Hz` The average power transferred per cycle ot capacitor isA. `230 W`B. `220 W`C. `40 W`D. Zero

In an a.c circuit, value of voltage and current change every instant.

1.	In an a.c circuit, value of voltage and current change every instant. Therefore, power of an a.c. circuit at any instant is the product of instantaneous voltages `(E)` and instantaneous current `(I)`. The average power supplied to a pure resistance `R` over a complete cycle of a.c is `P = E_(upsilon). I_(upsilon)`. When circuit is inductive, average power/cycle `= E_(upsilon) I_(upsilon) cos phi`, where `phi` is the phase angle between alternating voltage an altenating current in the circuit. In an a.c. circuit, `800 mH` inductor and a `60 mu F` capacitor are connected in series with `15 ohm` resistance. The a.c. supply to the circuit is `230 V, 50 Hz` The average power transferred per cycle ot capacitor isA. `230 W`B. `220 W`C. `40 W`D. Zero
Answer» Correct Answer - D `P_(C ) = E _(upsilon) I_(upsilon) cos phi` In a capacitor, phase difference, `phi = 90^(@)` `:. P_(C ) = E_(upsilon) I_(upsilon) cos 90^(@) = `zero

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