Professor De Boer's list of
TEXTBOOK ERRATA
(last update 1/06/2010)
Dorf & Svoboda,
Introduction to Electric Circuits, 6th Ed.
ISBN 0-471-44795-1, Wiley, 2004.
(link to errata for 7th edition)
First, see the author's list at http://www.clarkson.edu/~svoboda/errata/6th.html
In
addition, there are the following errata:
Page 23. Problem P1.3-4
Change the word "weight" to "mass."
(If the answer is going to be in grams, the the quantity
is mass, not weight.
Contributed by Aleks Bosnjak, posted 9/02/2009)
Page 56. Problem VP2-1
A non-standard symbol for the CCVS is shown. Here is a
link showing the problem statement with a standard symbol.
(Posted 9/02/2009)
Page 56. Problem DP2-3
Add 2 W, 5 W, and 10 W as available power ratings.
Page 63. Seven printed lines from the bottom of the page
Change "KCL" to "KVL." The affected sentence then begins:
"The KVL equation for this loop of Figure 3.3-1c is. . ."
Page 93. Problem P3.5-3
Change the last line of the problem statement from. . .
"absorbed by any one resistor." to. . .
"absorbed by any one resistor subject to maintaining
v = 8 V."
Page 97. Problem DP3-1
Change, "Specify the resistances R1 and
R2 so that. . ."
to, "Specify the resistances R1,
RP, and
R2 so that. . ."
(Some students have trouble realizing that they must specify RP in order to find values for the other two resistors.) (Posted 10/13/2009)
Page 143. Problem 4.7-12.
Change the CCVS from "5i1" to "(5 k
)i1." (In other words, the five should be five-thousand.)
(The problem is uninteresting as given in the text since when the CCVS is 5i1 the resulting voltage from the CCVS is practically zero and it can simply be replaced by a short. Also, the unit of "
Page 164, Table 5.5-1, method 2, part c (Also noted in the author's errata list)
Add "Set all independent sources to zero, then" between the "(c)" and the phrase "Connect a 1-A current source. . ." The edited phrase will read:
(c) Set all independent sources to zero, then
connect a 1-A source from terminal b
to terminal a. Determine vab. Then Rt = vab/1.
or
Rt = voc/isc.
Page 168, Table 5.6-1, method 2, part c
Add "Set all independent sources to zero, then" between the "(c)" and the phrase "Connect a 1-A current source. . ." The edited phrase will read:
(c) Set all independent sources to zero, then
connect a 1-A source from
terminal b to terminal a. Determine
vab. Then Rn = Rt = vab/1.
or
Rn = Rt = voc/isc.
Page 182, Just below Figure P5.3-1
A horizontal rule (line) is missing. This makes the boundary between Figures P5.3-1 and P5.3-3 ambiguous. Insert a horizontal rule just below the caption for Figure P5.3-1 and extend the rule across both columns. A corrected version of the page can be seen here. (posted 9/19/2008)
Page 184, Problem P5.5-6
At the top output node, to the upper-right of the 3 A source,
change the label "a" to "c".
(As printed there are two nodes labeled "a". One is at the top of the 6
Page 184, Problem P5.5-8
In the second line of the problem statement, after the end of of the sentence,
"in Figure P 5.5-8." insert the following sentence:
"The circuit box contains only linear circuit elements and independent sources."
(posted 1/06/2010)
Page 185, Problem P5.5-9 part (b)
In the second line of the problem statement, after the end of of the sentence,
"in Figure P 5.5-9." insert the following sentence:
"The circuit box contains only linear circuit elements and independent sources."
Also in part (b), change the "greater than" symbol to a "greater than or equal to" symbol so that the statement reads "(b) Given that R ≥ 0, determine. . ."
(In some printings the ">" symbol has been corrected to "≥") (updated 1/06/2010)
Page 186, Problem P5.6-4,
The answer is isc = 1.13 A, ("A" not "V").
Page 230, Problem P6.5-6,
Some answers shown are wrong. Correct answers are:
Va = –12/13 V, Vb = 0 V, Vc = 15/13 V.
Page 236, Problem DP6-5,
Insert the word "magnitude" after "output voltage."
The third sentence of the problem statement then reads,
"It is desired to provide an output voltage magnitude of 4 V."
(In the context of this chapter and the work done so far, students will interpret the 20 mV signal as DC, thus the need for the word, "magnitude," in the problem statement.)Page 275, Equation 7.11-1.
On the last line of the equation, change "t ≥ 4" to "t ≥ 14"
Page 282, Problem P7.3-6.
In the hint, delete "V" (the unit on x(t)).
Page 284, Problem P7.6-3.
In the hint, delete "V" (the unit on x(t)) in two instances.
Page 285, Problem P7.7-1
In the problem statement, change "mA" to "A" and "ms" to "s". In particular, the line that starts with "where" should read:
"where the units of time are seconds and the units of current are amperes."
After the last line, "The units of p(t) are W and the units of w(t) are J." add:
"Time, t, is in seconds."
Alternatively: change the answers to match the given units. ThenWhere in the answers, the units for p(t) are W, the units for w(t) are J, and t is in seconds.
Page 285, Problem P7.7-3,
The coefficient "3.6" in the answer shown for w(t) is incorrect.
The correct answer is w(t) = 36cos[1 – cos(200t)] mJ
(posted 10/18/2007)
Page 314 and page 315
In the second line from the bottom of page 314 and again in the first line on page 315 replace "t → 0" with "t → ∞."
(posted 11/07/2007)
Page 325, The equation above Equation 8.7-4
A "t" is missing at the end of in the last exponent. The correct equation is:
= [1/(a + b)]e–ate(a + b)t
(Posted 10/31/07)
Page 339, Problem P8.3-1,
In the schematic, change microfarads to millifarads,
Specifically, change "250
F" to "250 mF"
(This correction has been included in some later printings of the textbook.)
Page 341, Problem P8.4-1,
The answer given in the textbook is incorrect.
The correct answer is
Page 386, Table 9.14-2,
In the overdamped natural response both exponents should be positive, as shown here:
A1exp(s1t) + A2exp(s2t)
Page 387, Problem P9.3-1.
The problem statement should read:
Find the differential equation for vC in the circuit..."Also, label vC to the left of the capacitor with the "+" label on top.
(There are many differential equations "for the circuit." The vC equation is the one sought for the answer.)
Page 387, Problem P9.3-2.
The problem statement should read:
"Find the differential equation for iL in the circuit..."
Page 455, Problem P10.5-3.
In the given number for C a "degrees" symbol is missing in the exponent.
It should read C = 5ej2.3° (posted 11/16/2007)
Page 455, Problem P10.5-4.
In the exponent a "degrees" symbol is missing.
The last term before the equals sign should be 2ej15° (posted 11/16/2007)
Page 455, Problem P10.6-2.
In the answer, the correct angle is "84" degrees, not "85" degrees.
Page 456, Problem P10.7-3.
The unit on each current source should be "A" for amperes, not "V." (Two instances.)
Page 456, Problem P10.8-2.
The current arrow shown in the schematic is backwards. Change it so
that it points to the left. Also, the last line of the problem statement states
"
t = 2 x 106 rad/s."
The "t" should not be included. The corrected linestates "
= 2 x 106 rad/s."
(upsdated 11/27/2007)
Page 457, Problem P10.9-1.
Units are missing in the answers to parts (a) and (b).
Add an
symbol in three places after each of the complex
numbers. (posted 12/04/2009, updated 1/06/2010)
Page 460, Just below Figure P10.10-11
A horizontal rule is missing. This makes the boundary between Figures P10.10-11 and P10.11-4 ambiguous. Insert a horizontal rule just below the caption for Figure P10.10-11 and extend the rule across both columns. A corrected version of the page can be seen here.
Page 497, Equation 11.9-7.
The first di1/dt should be di2/dt.
The correct equation is v2 = L2(di2/dt) + M(di1/dt)
(posted 11/19/2007)
Page 514, Problem P11.4-4.
In the answer change "Irms = 5 mA" to "Irms = 4.33 mA"
(One could do an alternative problem, call it "part c," which is similar to part b except change the illustration to show half cycles of 10sin(wt) instead of full cycles of (5 – 5cos(2wt)) for the non-zero portions of the waveform. Then the correct answer will be 5 mA.)Page 546, Four lines from the top of the page.
In the angle for IaA the subscripts are in the wrong order.
Incorrect: "
IA"
Correct: "AI"(This errata is also noted in the publishers list.)
Page 556, Problem P12.6-1.
The correct answer is P = 9367 W (or P = 9370 W if rounded).
Page 556, Problem P12.7-1.
In the last sentence change "curents" to "current magnitudes" so that the last sentence reads, "Find the line current magnitudes and the power delievered to. . ."
Page 556, Problem P12.8-6.
Replace the "Hint" with: "Note: All voltages are line-to-line voltages."
(The number "41.6" in the given hint has a decimal error in it and the phrase "Y-connected source" is missleading to students since the source voltage and the building voltage are not the same.) Posted 10/01/2007Page 557, Problem P12.9-1.
Change "The motor operates at 20 hp at 74.6 percent efficiency." to read as:
"The motor provides a mechancial output of 20 hp at 74.6 percent efficiency."
(Posted 10/1/2007)
Page 558, Problem DP 12-3,
Change, "A three-phase motor delivers 100 hp and. . ." to read:,
"A three-phase motor delivers 100 hp of mechancial power and . . ."
(Posted 10/01/2007)
Page 687, Eq. 15.5-2.
The lower limit of summation should be n = –
.
Disclaimer: This list of errata is provided by Professor De Boer for the use of his students in his courses. Professor De Boer has no connection to the book's publisher or the authors of the textbook. This list is offered as is, with no guarantee of any kind. (This list is likely to be incomplete at the least.)
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