A resistance of

PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A resistance of

30\,\Omega

, an inductance of

0.12\,\text{H}

and a capacitance of

100\,\mu\text{F}

are connected in series to a

220\,\text{V}

(rms) ac source whose frequency can be varied. (i) Calculate the frequency at which the circuit draws maximum rms current. (ii) For the frequency obtained in part (i), compute the magnitude of the rms current. (iii) At this frequency, what is the value of the phase angle and what does it signify about the nature of the circuit?

Related theory

AC Circuit Analysis
Resonance in AC Circuits
Resonance and LC oscillations
Alternating Current

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