For a given series LCR circuit the current–frequency graph at resonance is shown as a…
PHYSICS · Subjective · CBSE · Physics · Alternating Current · Alternating Current
Problem
For a given series LCR circuit the current–frequency graph at resonance is shown as a sharp peak.
(a) On a qualitative sketch of the graph, label the resonant frequency f0 and the half-power points.
(b) If the resistance of the circuit is reduced to half its original value while L and C remain the same, sketch on the same axes the new current–frequency curve.
(c) Explain physically why the curve changes as sketched in part (b) with reference to energy dissipation, quality factor and bandwidth.