An AC source of variable frequency is applied across a series L-C-R circuit. At a frequency double the resonance frequency, the impedance is √10 times the minimum impedance. The inductive reactance is
Figure 7.21 shows a
series LCR circuit connected to a variable frequency 230 V
source. L = 5.0 H, C = 80μF,
R = 40 Ω
the source frequency which drives the circuit in resonance.
(b) Obtain the impedance of the circuit and the amplitude of
current at the resonating frequency.
(c) Determine the rms potential drops across the three
elements of the circuit. Show that the potential drop across the LC
combination is zero at the resonating frequency.