33. Alternating Current Circuits

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33. Alternating Current Circuits

Problem Solving

Suggested Practice Test problems:
Chp34: 54-60, 62-64, 66-68

Problem 1
Consider the parallel RLC ac
circuit shown in the Fig. The
emf of the ac source is
∆V = E0 cos ωt

a) Determine the complex amplitude of the current
through all branches of the circuit
b) What is the equivalent impedance of the circuit?
c) Derive an expression of the total power P(ω)
taken up by the circuit?
d) For what value of ω is P=max, and what is this
maximum value?

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Problem 2
L         R
In the ac circuit shown in
the figure:
a) calculate the intensities                        C
of the currents through all
three circuit elements.
~ e = E cos ωt
0
b) calculate the mean (average) power absorbed by the
circuit
c) Is there any resonance frequency for this circuit? If
yes, determine its value
d) What is the quality factor Q for this circuit?

Problem 3

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Problem 4

For next Lecture:

34. Electromagnetic Waves
34.1 Maxwell's Equations and Hertz's
Discoveries
34.2 Plane Electromagnetic Waves
34.3 Energy Carried by EM Waves

Suggested homework problems:
Chp.34:3-8,11-16,21-23

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