A resistor of

PHYSICS · Multi-part · CBSE · Physics · Alternating Current · Alternating Current

Problem

A resistor of

40\,\Omega

, an inductor of

120\,\text{mH}

and a capacitor of

30\,\mu\text{F}

are connected in series to a

200\,\text{V}

(rms) a.c. source. (a) Calculate the rms current in the circuit when the supply frequency is

50\,\text{Hz}

. (b) Calculate the rms current when the supply frequency is raised to

100\,\text{Hz}

. (c) Which of the two frequencies gives the larger current? Give a brief reason based on your calculations. (d) Determine the ratio of the currents obtained in parts (a) and (b).

Related theory

AC Circuit Analysis
Alternating current
Series LCR circuit
AC applied to a series LCR circuit

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