A (rms), a.c. source is connected across a resistor of , an inductor of and a…

PHYSICS · Subjective · CBSE · Physics · Alternating Current · Alternating Current

Problem

220\,\text{V}

(rms),

50\,\text{Hz}

a.c. source is connected across a resistor of

30\,\Omega

, an inductor of

100\,\text{mH}

and a capacitor of

50\,\mu\text{F}

in series. (a) Calculate the magnitude of the impedance of the circuit at

50\,\text{Hz}

. (b) Determine the phase angle between the source voltage and the circuit current at this frequency, stating clearly whether the current leads or lags. (c) The supply frequency is now doubled to

100\,\text{Hz}

while all component values remain unchanged. Find the new impedance and phase angle. (d) Comment on how the power factor of the circuit changes when the frequency is doubled.

Related theory

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