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Question

A series L-C-R circuit with R = 20 Ω L = 1.5 H and C = 35μ F is connected to a variable frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit, the average power transferred to the circuit in one complete cycle is

A
0.5 KW
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B
1.0 KW
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C
2.0 KW
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D
4.0 KW
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Solution

The correct option is C 2.0 KW
Pav=VrmsIrmscosΦ
Φ=0 (resonancecondition)
hence,Pav=V2rmsR
=200×20020=2000
2KW.

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