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(In Alexander & Sadiku unless otherwise noted)
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Review for final exam
12/12
at
5:00 PM
12/13
Read 12.10, 12.11
Do 12.71, P11.6-6 from
another textbook. (Your web brouwser must be
logged into courses@dordt for the above link
to work.)
Hint on P11.6-6: The power angle is defined
as (θv – θi) but θv = 0 due to the location
of the given reference node. Then what is θi ?
Note errata on pages 534-535 and page 541.
Optional Reading: more on "Split-Phase" and on
"High-Leg Delta" (also called red-leg, orange-
leg, wild-leg, stinger-leg, bastard-leg and similar
off-color names) and still more on "Open-Delta"
(sroll to last section of the page)"
On Wednesday, 12/12 there will be a box labeled
"EGR 220 Homework" near Prof. De Boer's office
door. Drop your homework in the box by 5 PM
Wednesday, 12/12 for final grading.
This problem set will be graded and ready for
pickup by 5 PM Thursday, 12/13. Pick your
homework up from Prof. De Boer's plastic bin
near the engineering pod door.
12/12
12/13
S = P + jQ = √3VLIL/θ
Read 12.7
Do 12.33, 12.36
Note errata on Problem 12.36 part (c).
This problem set will be graded and ready for
pickup by 5 PM Thursday, 12/13. Pick your
homework up from Prof. De Boer's plastic bin
near the engineering pod door.
12/10
12/12
Various connections between Y and Δ
Read 2.7, 12.4, 12.5, 12.6
Do 2.51, 12.11, 12.14
Note errata on page 513, Figure 12.15.
Note errata on Problems 12.11 and 12.14
12/07
12/10
Read 12.1, 12.2, 12.3
Do 12.5, 12.7, 12.10
Note errata on page 506, Figure 12.5.
Note errata on the answer to Problem 12.5.
Note errata on Problem 12.7.
Note 1.) All voltages and currents given
in Chapter 12 are RMS unless otherwise noted.
Note 2.) "Determine the current," means "find
the RMS value of the current," which is what
an AC ammeter does. There is no angle in the
answer. Only give phasors as answers when
phasors are requested.
Note 3.) Use the phasor transform when
possible. It makes these problems easier.
12/05
12/07
Read 11.9, 11.10
Do 11.77, 11.80, 11.84
Note errata on Problems 11.51 and following.
Note errata on Problems 11.80 and 11.84.
12/03
12/05
Power Factor Correction
Read 11.7, 11.8
Do 11.63, 11.69, 11.91
Note errata on Problems 11.51 and following.
Note errata on the answer to Problem 11.69(b).
Note errata on the answer to Problem 11.91.
11/30
12/03
Read 11.5, 11.6
Do 11.41, 11.47, 11.48,
Note errata on Problem 11.48.
11/28
11/30
Read 11.4
Do 11.24, 11.25, 11.29
Optional: What do you think of this video "You see it's aah... drawin' about two amps of power... now I'm gona plug this in... and it's gone down to about one and a half amps of power..." (Quotation from the video.)? And,
if you liked that one, you might also like this one! "...converts one power source and puts it into four, each costing 25% of the electricty..." (Quotation from the video.)
We can discuss these cliams in class if you like.
11/19
11/28
reactive power, and power factor angle
Read 11.1, 11.2, 11.3, Extension of Eq. (11.5)
Do 11.1, 11.3, 11.13
Note errata on Problem 11.13.
Optional: What do you think of this video "You see it's aah... drawin' about two amps of power... now I'm gona plug this in... and it's gone down to about one and a half amps of power..." (Quotation from the video.)? And,
if you liked that one, you might also like this one! "...converts one power source and puts it into four, each costing 25% of the electricty..." (Quotation from the video.)
We can discuss these cliams in class if you like.
11/16
11/19
Read 10.4, 10.5, 10.6, 10.10
Do 10.7, 10.54, 10.55
Note errata on the answer to Problem 10.55
11/14
11/16
and Sinusoidal Steady-State Circuit Analysis
Read 9.7, 10.1, 10.2, 10.3
Do 9.59, 9.90, 10.27
Hints for 9.90: KVL around the loop using the
three labled phasors is helpful. The phasors
form a triangle. Take V1 as the reference phasor
(has angle zero). A graph of these phasors
drawn to scale can be helpful to estimate
angles for the phasors and the "Law of Cosines"
can be used to find them analytically. Once
the three phasor angles are known the loop
current phasor can be found, etc.
11/12
11/16
Topic: Definition of impedance (Z = V/I)
Review 9.3, Read 9.4, 9.5
Do 9.23, 9.25, 9.29, 9.35
Note errata on problems 9.23 and 9.29 and 9.35
11/09
11/14
Read 9.3
Do 9.9, 9.11, 9.12, 9.19
Note errata on the answers to
Problems 9.9(a) and 9.11(d).
Also look over the test coverage before Monday.
Optional Reading:
Prof. De Boer's notes on sinusoidal steady state
11/05
11/09
Read 9.1, 9.2, App. B on pages A-9 through A-15
Do 9.1, 9.2, 9.3, 9.13
Note trigonometric identities in Appendix C.
Optional Reading:
Prof. De Boer's notes on complex numbers
Note: Class on Friday, 11/02 is cancelled.
Note errata on the answer to Problem 9.1
10/31
11/01
Read 8.7, 8.11, 8.12
Do 8.45 except change the 2 Ω resistor
to 1 Ω. The answers then are v(t) = 6e-tsin(t) V
and i(t) = 4 – 3e-t[cos(t) + sin(t)] A
Also do 8.61
Note errata on Problem 8.45
Optional: Read 8.10. Note errata on page 350.
(On Friday, 10/26 at 10:57 PM a sign error in the answer
for Problem 8.45 shown on this page and a units error
on this page and in the errata sheet for Problem 8.45
with a 1 Ω resistor was corrected.)
10/29
10/31
Review 8.4, Read 8.5, 8.6
Do 8.24, 8.37
10/26
10/29
over- critically- and under-damped.
Review 8.3, Read page 323 to end of
Section 8.3, and all of Section 8.4.
Do 8.9, 8.14, 8.23
Note errata on the answer to Problem 8.9
Note errata on Problems 8.14 and 8.23.
Note errata on pages 321 and 323 and I-3.
(Errata on answer for 8.9 was posted on 10/24.)
10/24
10/26
Series RLC over- and critically-damped.
Read 8.1, 8.2, 8.3 only through page 322.
Do 8.1, 8.4, 8.7
Note errata on pages 321 and 323 and I-3.
10/22
10/24
Review Ch. 7 Sec. 1-6, Read 7.9, 7.10
Do 7.28, 7.31, 7.85
Note errata on the answer to Problem 7.31
(Errata was posted on 10/24.)
10/19
10/22
Read 7.5, 7.6
Do 7.39, 7.47, 7.51
10/17
10/19
Review 7.1, 7.2, 7.3, Read 7.4
Do 7.4, 7.13, 7.27
10/15
10/17
Read 7.1, 7.2, 7.3
Do 7.1, 7.2, 7.11
10/12
10/17
Review 6.1 through 6.5, Read 6.6, 6.7
Do 6.6, 6.21, 6.67
Note errata on Problem 6.67 and
the answer to Problem 6.67.
10/10
10/12
Topics: Inductors, energy storage in mag-field,
series and || combinations of inductors
Read 6.4, 6.5
Do 3.15, 3.81, 6.40, 6.46
Note: Do 3.15 and 3.18 during lab. You must
solve them using the PSpice circuit simulator.
10/08
10/12
series and || combinations of capacitors
Read 6.1, 6.2, 6.3
Do 6.5, 6.13, Repeat 6.13 except change the
60 V source to 40 V and change the 20 Ω
resistor to 50 Ω.
Note errata in Eq 6.5 and Eq 6.6 and this.
Note: Please review homework standards for
matters on the size and quality of graphs that
are answers.
10/1
10/08
Read 5.7, 5.8, 5.10
Do 5.50 part (a) only, 5.66, 5.88
Hint for 5.66: Put everything except the last
op-amp and the 100 kΩ resistor in a one-port
network and reduce that to a Thevenin
equivalent.
Hint for 5.88: There are two voltage dividers
in the diamond-shaped group of resistors (the
"bridge") and one instrumentation amplifier in
the given circuit.
Optional: Find out more about power steering.
9/28
10/01
Read 5.4, 5.5, 5.6
Do 5.19, 5.27, 5.39.
Optional: Learn more about decibels via the
wikipedia or The University of New South Wales
or take a free hearing test to hear what
"decibels" mean to you.
9/26
9/28
Read 5.1, 5.2, 5.3, 14.3 (page 617-618)
In Section 14.3 note equation 14.10.
Do 5.1, 5.5, 5.9
Hint for 5.1: In the application of Eq. 14.10 to
Problem 5.1 assume R1 = R2. The phrase
"voltage gain" is a signal to use this
assumption even if it is untrue.
Hint for 5.9: Since the specifications for the
op-amp (Ri, Ro, A) are not given, assume it is
ideal. This is the customary practice whenever
the data needed to describe non-ideal behavior
is not given.
Note errata on the answer to Problem 5.5
Optional: View this anamated tutorial From ASU
on the topic of the ideal op-amp.
The tutorial uses the word impedance. This is a
generalization of resistance. We will study impedance
later in this course. For now, just consider it to mean
the same thing as resistance.
9/24
9/26
Read 4.8, 4.10
Do 4.67, 4.68
9/21
9/24
Review Examples 4.8, 4.9, 4.10 (pgs 140-145)
Read 4.6. Optional: Read 4.7
Do 4.39, 4.47, 4.64
Note errata on the answer to Problem 4.47
9/19
9/21
Read 4.4, 4.5
Do 4.20, 4.23, 4.33
Note errata on problems 4.20 and 4.23
9/17
9/21
Read 4.1, 4.2, 4.3
Do 4.3, 4.6, 4.9
Note on Problem 4.3: For full credit on you
must use linearity for parts (b) and (c).
Note on Problem 4.6: For full credit you must
explain (use a sentence or two) how you got
your answers.
9/14
9/19
Read 3.7, 3.9
Do 3.62, 3.63, 3.89
Note: We will cover Section 3.8 in the lab.
Note errata on Page 109, Figure 3.40(b)
9/12
9/14
Mesh, Supermesh
Read 3.4, 3.5.
Do 3.34, 3.41, 3.44
Note: we will skip Section 3.6 in the textbook.
It is trickier than it looks--not worth your
time.
Optional: Why become an engineer? Watch this
Engineering Careers Intro. (The link at
the end of the video is no longer relevant.
Prof. De Boer does not endorse every statement
made in this video, but it does provoke thought.)
9/10
9/12
Review 3.1, 3.2, Read 3.3
Do 3.4, 3.17, 3.18
9/07
9/10
Read 3.1, 3.2 in your textbook
Optionally review Sections 7, 8, 13 in IEE.
Do 3.2, 3.7, 3.10
Optional:
Video lecture: The Passive Sign Convention
Video lecture: Passive Sign Cnvntn Examples
Note: The passive sign convention is easy once you
clearly understand it. However, there are lots of bad
descriptions of it floating around on the Internet.
Stick with the IEE handout, the videos above, or ask in
class rather than searching the Internet yourself on
this matter.
See
note
1
below
9/05
9/07
Read: 2.8, 2.9 in your textbook
Read: Sections 9, 10, 11 in the IEE handout.4
Do 2.69, 2.74, from your textbook and
12, 13, and 14 from the IEE handout.
Note errata on Page 59, Figure 2.55 part (b)
Note errata on Page 60, Practice Problem 2.16
Optional: The Grid. (13 min. video)
Optional: read about arc flash and watch
When good transformers go bad,
480 volt 3-phase Arc Flash Demonstration
A real-life arc-flash accident.
The point is that safety matters. Electric
circuits can delever impresseive amounts of
destructive energy when failures happen.
9/03
See
note
2
below
9/05
See
notes
3 & 4
below
voltage, resistance, power, KVL, KCL
Scan Chapter 1 and Chapter 2 through
Section 2.6 in your textbook
Review sections 1 though 6 in the handout,
"An Introduction to Electrical Engineering."4
Do these end-of-chapter problems in your
textbook: 1.2, 1.11, 1.18, 2.10, 2.31.
Note errata in your textbook4 on
Practice Problems 1.2 (page 8) and Practice
Problem 2.8 (page 42). Also note additional
errata on pages 5, 9, 23, and 27.
Optional: 14 minute video on fuel cell cars.