Professor De Boer's list of
TEXTBOOK ERRATA
(last update 1/06/2010)
Dorf & Svoboda,
Introduction to Electric Circuits, 7th Ed.
ISBN 0-471-73042-4, Wiley, 2006.
(link to errata for 6th edition)
Page 16. Problem P1.2-6.
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 51. Problem P2.10-1
A non-standard symbol for the CCVS is shown.
Here is a link showing Figure P 2.10-1 with a standard symbol.
(Posted 9/02/2009)
Page 52. Problem DP2-3.
Add 2 W, 5 W, and 10 W as available power ratings.
Page 57. Six printed lines above Example 3.2-2.
Change "KCL" to "KVL." The affected sentence then begins:
"The KVL equation for this loop of Figure 3.2-1c is. . ."
Page 91. Problem P3.4-3
Change the last line of the problem statement from . . .
"by any one resistor." to. . .
"by any one resistor subject to maintaining v = 8 V."
Page 100. 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 150. Problem 4.7-5.
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 191, Problem P5.4-6
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 191, Problem P5.4-8
In the second line of the problem statement, after the end of of the sentence,
"in Figure P 5.4-8." insert the following sentence:
"The circuit box contains only linear circuit elements and independent sources."
(posted 1/06/2010)
Page 191, Problem P5.4-9
In the second line of the problem statement, after the end of of the sentence,
"in Figure P 5.4-9." 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 239, Problem P6.4-6.
Some answers shown are wrong. Correct answers are:
va = –12/13 V, vb = 0 V, vc = 15/13 V.
Page 248, 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 283, Equation 7.10-1.
On the last line of the equation, change "t ≥ 4" to "t ≥ 14"
Page 299, Problem P7.6-3,
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 326 about 2/3 down the page
Replace "t → 0" with "t → ∞" in two places.
(posted 11/07/2007)
Page 335, Equation 8.7-4
A "t" is missing at the end of in the last exponent in the expression just before the last "=" sign. The correct expression is:
. . . = [1/(a + b)]e–ate(a + b)t = ebt/(a + b)
(Posted 11/01/2007)
Page 353, Problem P8.4-1.
The answer should be:
Page 400, Problem P9.2-1.
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 400, Problem P9.2-2.
The problem statement should read:
"Find the differential equation for iL in the circuit..."
Page 475, Problem P10.5-2.
In the answer, the correct angle is "84" degrees, not "85" degrees.
Page 477, Problem P10.7-2.
In the schematic the current arrow is backwards. It should point to the left.
(posted 12/06/2006)
Page 477, Problem P10.8-1.
Units are missing in the answers to parts (a) and (b).
Add an
symbol in three places after each of the complex
numbers. (posted 1/06/2010)
Page 543, 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 588, Problem P12.5-1.
The correct answer is P = 9367 W (or P = 9370 W if rounded).
Page 588, Problem P12.6-1.
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 589, Problem P12.7-6.
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 10/01/2007
Page 589, Problem P12.8-1.
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 590, 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 726, 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.)