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(In Alexander & Sadiku unless otherwise noted)
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(Study for final exam.)
12/07
at
5 PM
12/08
at
10 AM
Line and Phase Voltages and Currents
Power in a balanced 3-phase circuit.
Read 12.4, 12.7, 12.10.1
Note Table 12.1, pg 518.
Also Read Section 2.7 (pages 52–58) and
note especially Eq. 2.57 on page 55. See also
pages 392 and 393 and Eq. 9.69.
Do 12.33
Note errata on Figure 12.15.
Note errata on pages 534–535.
On Wednesday, 12/07 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, 12/07 for final grading.
This problem set will be graded and ready for
pickup by 5 PM Thursday, 12/8. Pick your
homework up from Prof. De Boer's plastic bin
near the engineering pod door.
12/07
12/08
at
10 AM
Read 12.1, 12.2, 12.3
Do 12.5, 12.7, 12.10
Note errata on the answer to Problem 12.5.
Note errata on Problem 12.7.
Note 1.) The answers for 12.5 are in the
time domain. (Use inverse phasor transform)
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.) All voltages and currents given
in Chapter 12 are RMS unless otherwise noted.
Note 4.) Use the phasor transform when
possible. It makes these problems easier.
Then use the inverse transform to express your
answers in the time domain if needed.
This problem set will be graded and ready for
pickup by 5 PM Thursday, 12/8. Pick your
homework up from Prof. De Boer's plastic bin
near the engineering pod door.
12/05
12/07
and Farm "Split-Phase" Wiring.
Read 11.6, 11.8, 11.9, 11.10, 12.10.2
Optional Reading: more on "Split-Phase"
Do 11.47, 11.48, 11.69, and 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 Problem 11.48.
Note errata on the answer to Problem 11.69(b).
12/02
12/05
Power and Power Factor
Read 11.4, 11.5
Do 11.24, 11.25, 11.29, 11.41
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.
11/30
12/02
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.
11/21
11/30
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.
11/18
11/21
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
11/16
11/18
Read 9.3
Do 9.9, 9.11, 9.12, 9.19
Note errata on the answer to problem 9.11(d).
Optional Reading:
Prof. De Boer's notes on sinusoidal steady state
You must be logged into courses@dordt for the above
link to work.
11/14
11/16
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
You must be logged into courses@dordt for the above
link to work.
11/11
11/14
Read 8.5
Do 8.37, 8.45 except make the changes shown in
the errata and 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
Note errata on problem 8.45
(On Wednesday at 8:30 PM a sign error in the answer
for 8.45 with a 1 Ω resistor was corrected.)
11/09
11/11
Read 8.1, 8.2, 8.3, 8.4
Do 8.3, 8.7, 8.14
Note errata on Problem 8.14.
Note errata on pages 321 and 323 and I-3.
(This assignment is not due on Friday. Please carefully
note the due dates.)
11/07
11/09
Review 7.4, Read 7.9, 7.10
Do 7.31, 7.85, 7.90
Hint on 7.90: Since Rp >> Rs the time constant
does not depend much on Rp or the Thevenin
equivalent resistance of the input voltage, vi .
However, for best accuracy assume that vi
typically has about zero internal resistance
compared to Rp. Thus Rp accounts for all of the
resistance the oscilloscope sees. This is
equivalent to assuming that the oscilloscope
probe has negligible loading effect on the
circuit being tested (to observe voltage vi).
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Wednesday, 11/2. Details on courses@dordt.
11/04
11/07
Review 7.4, Read 7.5, 7.6
Do 7.28, 7.39, 7.51
10/31
11/04
Review 7.1, 7.2, 7.3, Read 7.4
Do 7.4, 7.13, 7.27
10/28
10/31
Read 7.1, 7.2, 7.3
Do 7.1, 7.2, 7.11
10/26
10/28
Review 6.1 through 6.5, Read 6.6, 6.7
Do 6.6, 6.21, 6.67 except add this sentence to
the problem statement, "Assume that at t = 0
the output voltage is zero."
10/24
10/26
series and || combinations of inductors
Read 6.4, 6.5
Do 6.40, 6.46
10/21
10/26
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.
10/19
10/24
Read 5.4, 5.5, 5.6, 5.7
Do 5.19, 5.27, 5.39, 5.50 part (a) only.
10/17
10/19
Review meters, Read 5.3
Do 2.67, 5.9
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.
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.
10/14
10/17
Review Ch 4. Read 5.1, 5.2
Do 4.86, 5.1, 5.5
Hand in PSpice ouptut files for problems 3.15,
3.81. These two problems were done during lab.
Note on 4.86: If you use a theorem, such as
Thevenin's or Norton's Theorem, you must
explain the evidence at hand to show that the
Theorem is applicable. (These theorems do not
apply to just any black box.)
Hint: A method of solving 5.5 is to replace the
op-amp with its model. Then do nodal analysis.
Example 5.1 (page 178–179) is similar.
Note errata on 5.5
10/12
10/14
Read 4.8, 4.10
Do 4.67, 4.68
10/10
10/12
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 4.47
10/05
10/10
Read 4.4, 4.5
Do 4.20, 4.23, 4.33
Note errata on problems 4.20 and 4.23
10/03
10/05
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.
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Wednesday, 9/23. Details on courses@dordt.
9/30
10/05
Read 3.7, 3.9
Do 3.62, 3.63, 3.89
Note errata on Figure 3.40(b)
9/26
9/30
Browse 3.4, Read 3.5
Do 3.34, 3.41, 3.44
9/23
9/26
at
3:00 PM
in
lab
or in
bin
Review 3.1, 3.2, Read 3.3
Do 3.7, 3.17, 3.18
Reminder: Research Paper Pt. 1 due on 9/23
Note: This assignment was originally posted with an
error in the list of problems. Problem 3.4 was shown
but that had already been included in PS # 11. It was
Corrected to "3.7" on 9/19 at 4:15 pm
9/21
9/23
Read (in A&S) 3.1, 3.2
Do (in A&S) 3.2, 3.4, 3.10
Hint for 3.4: The solutions are all integers.
9/19
9/21
Read (in A&S) 2.8, 2.9
Do (in A&S) 2.26, 2.69, 2.74
9/16
9/19
In Alexander & Sadiku's text, Scan Chapter 1
and Chapter 2 through Section 2.6
Review as necessry.
You may also refer to the "Introduction to
Electrical Engineering" handout.
Do these problems found at the ends of the
chapters in Alexander and Sadiku's text:
1.2, 1.11, 1.18, 2.10, 2.31
Also, see Note 5 at the bottom of this page.
9/14
9/16
Read: Section 16
Do: Problems 27, 28, 29, 30
9/12
9/14
Read: Review Sections 13, 14, 15
Do: Problems 24, 25, 26
Optional Reading: A former bestselling book,
Tracy Kidder, The Soul of a New Machine
Available at the John & Louise Hulst Library
call number TK7885.4.K53 1990.
Read a reveiw here and some quotes.
Read page samples here.
9/09
9/12
Read: Sections 14, 15
Do: Problems 19, 20, 21, 22, 23
9/07
9/09
"1984," Circuit Analysis—definitions
Read Sections 10, 11, 12, 13
Do: Problems 14, 15, 16, 17, 18
Optional: Nova Video, "Decoding Nazi Secrets"
A quote from the show,
". . . brains over bullets."
Available at The John & Louise Hulst Library
Call no. D810.C88 D42 1999 (2 hrs, VHS)
Companion web site at PBS
1984 Apple Macintosh Commercial (You Tube)
Wikipedia on the Apple Commercial
The importance of understanding units
Does Does $0.002 = 0.002 cents?
9/05
9/07
Passive Sign Convention, History of EE
Read: Sections 8, 9
Do: Problems 10, 11, 12, 13
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.
Optional:
Will your worldview influence your work?
Here are some videos on the matter:
History of Pong Interview: Nolan Bushnell
Challenge: Do you want to be like Bushnell?
9/02
9/05
Read: Section 6, 7
Do: Problems 7, 8, 9
See
note
1
below
8/31
9/02
Sections 4 and 5 (Up to section 6, p12.)
Do: Problems 5, 6
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
Another 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.
8/29
See
note
2
below
9/02
See
note
3
below
Sections 1, 2, 3
Do: Problems 1, 2, 3, 4
Optional: 14 minute video on fuel cell cars.