NCERT Class XII Chapter
Alternating Current
Questions With Solutions
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Question : 9
Total: 26
A series LCR circuit with R = 20 Ω, L = 1.5 H and C = 35 μF is connected to a variable-frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle?
Solution:
Average power transferred to the circuit in one complete cycle at resonance
P =E v I c
P =E v
At resonance Z = R, cos ϕ = cos 0° = 1
P = 200 ×
P =
P =
At resonance Z = R, cos ϕ = cos 0° = 1
P = 200 ×
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