Q7.11 (b) Figure shows a series LCR circuit connected to a variable frequency source.
, , .
(b) Obtain the impedance of the circuit and the amplitude of current at the resonating frequency.
Variable frequency supply voltage = 230V
The impedance of the circuit is
at Resonance Condition
Hence, Impedance at resonance is 40.
Now, at resonance condition, impedance is minimum which means current is maximum which will happen when we have a peak voltage, so
Current in the Resonance circuit is Given by
Hence amplitude of the current at resonance is 8.13A.
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