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In an AC circuit with voltage V and curr...

In an `AC` circuit with voltage `V` and current `I`, the power dissipated is

A

`VI`

B

`1/2 VI`

C

`1/(sqrt(2)) VI`

D

Depened on the phase between `V` and `I`

Text Solution

Verified by Experts

The correct Answer is:
D

`:' P=Vicos varphi, `:.` P prop cos varphi`
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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 ot capacitor is

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