A series – – circuit contains a inductor

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

Problem

A series

R

–

L

–

C

circuit contains a

0.20\,\text{H}

inductor, a

50\,\mu\text{F}

capacitor and a

20\,\Omega

resistor connected to a

220\,\text{V}

(rms) AC mains supply whose frequency can be adjusted. (i) Calculate the frequency at which the circuit is in resonance. (ii) Find the rms current in the circuit at this frequency. (iii) Determine the rms current when the supply frequency is reduced to

75\%

of the resonant frequency.

Related theory

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

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