HPHY 253 Homework 33b
AlternatingCurrent Circuits
Dr. A. E. Bak
Name
1. Serway & Jewett Problem
33
:
21
. A
RLC
circuit consists of a
150

°
resistor, a
21
:
0

°F
capacitor, and
a
460

mH
inductor connected in series with a
120
V
,
60
:
0

Hz
power supply.
(a) What is the phase angle between the current and the applied voltage?
(b) Which reaches its maximum earlier: the current or the voltage?
2. Serway & Jewett Problem
33
:
24
. An AC source with
±
V
max
= 150
V
and
f
= 50
:
0
Hz
is connected
between points
a
and
d
in Figure
P
33
:
24
.
(a) Calculate the maximum voltage between points
a
and
b
.
(b) Calculate the maximum voltage between points
b
and
c
.
(c) Calculate the maximum voltage between points
c
and
d
.
(d) Calculate the maximum voltage between points
b
and
d
.
3. Serway & Jewett Problem
33
:
46
. Consider the °lter circuit shown in Active Figure
33
:
23
a
.
(a) Show that
±
V
max
out
±
V
max
in
=
1
=
(
!C
)
q
R
2
+
°
1
!C
±
2
is the gain ratio, that is, the ratio of output to input voltage amplitudes.
(b) What value does the gain ratio approach as the frequency decreases toward zero?
What value
does the gain ratio approach as the frequency increases without limit?
(c) At what frequency is the gain ratio equal to onehalf?
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 Spring '09
 bak
 Alternating Current, Inductor, Irms, Jewett Problem

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