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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 t inductors isA. zeroB. `40.10 W`C. `20.05 W`D. `20.5 W` |
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Answer» Correct Answer - A `P_(L) = E_(upsilon) I_(upsilon) cos phi` In an inductor, phase difference `phi = 90^(@)` `:. P_(L) = E_(upsilon) I_(upsilon) cos 90^(2) =` zero |
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