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An AC circuit consists of a resistance a...

An AC circuit consists of a resistance and a choke coil in series . The resistance is of 220 `Omega` and choke coils is of 0.7 H . The power abosorbed from 220 V and 50 Hz , source connected with the circuit , is

A

55 W

B

110 W

C

220 W

D

440 W

Text Solution

Verified by Experts

The correct Answer is:
B
`X_L = (2pifL) = 2pi xx 50 xx 0.7 = 220Omega`
`therefore Z = sqrt (R^(2) + X_L^(2) = 220sqrt 2 Omega`
`I_rms = V_rms/Z = 220 / 220sqrt 2 = 1/sqrt 2 A`
`P = I_rms^(2).R = 1/2 xx 220` = 110 W
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