A series – – circuit is supplied by a sinusoidal source of rms voltage
PHYSICS · Subjective · CBSE · Physics · Alternating Current · Alternating Current
Problem
A series R–L–C circuit is supplied by a sinusoidal source of rms voltage 230V. The circuit elements have the following values:
R=100Ω, L=0.318H, C=159μF. The supply frequency can be varied.
(a) When the frequency is 40Hz, calculate the inductive reactance, the capacitive reactance, and the impedance of the circuit. Hence find the phase difference between the supply voltage and the current, stating whether the current leads or lags.
(b) For the frequency of 40Hz obtained in part (a), determine the time lag between the voltage maximum and the current maximum.
(c) Repeat the calculations of parts (a) and (b) for a frequency of 50Hz. Comment briefly on the values of the phase difference and the time lag at this frequency.