978-0128012420 Chapter 10 Part 2

subject Type Homework Help
subject Pages 11
subject Words 2120
subject Authors George Wise, Philip Kosky, Robert T. Balmer, William D. Keat

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18
10-17) An automobile’s 12 V battery is used to light the automobile’s two headlights.
Each headlight can be modeled as a single resistor. If the two headlights are hooked up to
the battery in parallel to form a circuit, and each headlight is to produce a power of 100
W, what should the resistance of each headlight be?
Need: Resistance, R = ____Ω
Know: Same circuit as Problem 16, but different resistances for the bulbs.
Parallel circuit with two filaments each of R Ω and a 12 V battery.
R
I
12
V
I
1
I
2
V
=
V
=
0. V
R
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10-18) Suppose one of the headlights in problem 10.17 suddenly burns out. Will be the
power produced by the other headlight increase or decrease?
Need: Is P > 100. W or < 100. W?
Know: Circuit is now modified because one leg is burned out. V = 12 volts still
and R1 = 1.4 Ω still.
R
Ω
I
12
V
I
1
I
2
V
=
12 V
V
=
0. V
R
=
Ω
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10-19) Suppose a car has headlights operating in parallel, but with
different resistances, one of 2.0 Ω and the other of 3.0 Ω. Suppose the
headlight parallel circuit is connected in series with a circuit for a car
drawn from a 12 V battery when both the lights and the stereo are on?
I
Need: Current, I = ____ A
Know: Asymmetric parallel circuit with 2.0 and 3.0 Ω resistor in series with
1.0 Ω resistor all powered by a 12 V battery.
V
12
V
=
I
1
I
2
1.0
Ω
V
0. V
=
12
V
V?
2.0
Ω
3.0
Ω
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21
10 -20) Consider the circuit shown below. What are the currents Io through I6? (Hint:
What are the voltages Va and Vb? Note the symmetry between R1/R2 = 5.0/5.0 and R3/R4
= 10.0/10.0.)
12 V
Need: I0, I1, I2, I3, I4, I5, I6, ______A
Know: The circuit has several levels of symmetry so that several of the various
currents are equal by inspection and on the conservation of charge principle.
5.0
Ω
V
12
5.0
Ω
5.0
Ω
10.0
Ω
10.0
Ω
I
5
I
1
I
2
I
3
I
4
I
0
I
6
V
0
V
a
V
b
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Copyright ©2015, Elsevier, Inc
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10-21. Determine the output voltage, Vout, in Figure 10.5 if Vin = 90. V, R1 = 10. ohms,
and R2 = 50. ohms.
Need: Vout = ______ V.
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10-22. Use the same RadioShack stock resistors in Example 10.6 to design the
construction of a voltage divider that will reduce the voltage by a factor of 30.
Need: Vout /V1n = 1/30.
Know: 5.0, 10., 15., and 20. ohm resistors in stock
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10-23. Use Kirchhoff’s voltage and current laws to determine the voltage drop and
current in each of the three resistors below if R1 = 10. ohms, R2 = 20. ohms, and R3 = 30.
ohms.
Need: V, I in each of R1, R2, & R3.
Know: R1 = 10. ohms, R2 = 20. ohms, and R3 = 30. ohms. And V = 6.0 V
How: Kirchoff’s Laws
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10-24. If the resistors in Exercise 10.23 are all equal to 10. ohms (R1 = R2 = R3 = 10.
ohms), what is the current supplied by the 6.0 volt battery?
Need: I = ______A
Know: V = 6.0V and R1 = R2 = R3 = 10. Ω
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10-25. Determine the currents I1 and I2 in the current divider illustrated in Figure 10.7 if
V = 50.3 volts, R1 = 125. ohms, and R2 = 375. ohms.
Need: I1 = _____A, I2 = _______A
Know: Vin = 50.3 volts, R1 = 125. Ω, and R2 = 375.Ω
10-26. Repeat Example 10.7 with the resistor R1 changed to 100. Ω and all other values
remain unchanged.
Need: I3 = ______ A
C
D
R
1
100
.
Ω
R
2
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28
Know: R1 = 100. Ω, R2 = 20.0 Ω,
R3 = 40. Ω; V1 = 10. V, V2 = 20. V.
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10-27. Repeat Example 10.7 with V1 increased to 100.volts and V2 reduced to 5.0 volts.
Need: I3 = ______ A
Know: R1 = 40. Ω, R2 = 20.0 Ω, R3 = 40. Ω; V1 = 100. V, V2 = 5.0
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10-28. Determine the currents I1, I2, I3, and I4 in the figure below.
.
Need: I1, I2, I3, and I4
6.0
Ω
12
.
Ω
9.0
Ω
9.0
Ω
i =
5.0
12
. V
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10-29. It is the last semester of your senior year and you are anxious to get an exciting
electrical engineering position in a major company. You accept a position from company A
early in the recruiting process, but continue to interview hoping for a better offer. Then your
dream job offer comes along from company B. More salary, better company, more options for
advancement, it is just what you have been looking for. What do you do?
a) Accept the offer from company B without telling company A (just don’t show
up for work).
b) Accept the offer from company B and advise company A that you have
changed your mind.
c) Write company A and ask them to release you from your agreement.
d) Write company B thanking them for their offer and explain that you have
already accepted an offer.
Summarize using an Engineering Ethics Matrix.
1) Apply the Fundamental Canons: Engineers, in the fulfillment of their professional
duties, shall:
1) Apply the Engineering Ethics Matrix
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32
Options
Canons
a) Accept B
without telling
A
b) Accept B,
notify A
c) Ask A for
release
d) Refuse B,
stick with A
Hold paramount
the safety,
health and
welfare of the
public.
Does not apply
Does not apply
Does not apply
Does not apply
Perform
services only in
the area of your
competence
Does not apply
Does not apply
Does not apply
Does not apply
Issue public
statements only
in an objective
and truthful
manner
Does not apply
Does not apply
Does not apply
Does not apply
Act for each
employer or
client as faithful
agents or
trustees
Does not apply
Does not apply
Does not apply
Does not apply
Avoid deceptive
acts
No
Yes
Yes
Yes
Conduct
themselves
honorably
No
No
Yes
Yes
Solution: The canons narrow down the list of acceptable options to c) and d).
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10-30. A female student in your class mentions to you that she is being sexually harassed by
another student. What do you do?
a) Do nothing; it is none of your business.
b) Ask her to report the harassment to the course instructor.
c) Confront the student accused of harassment and get their side of the issue.
d) Talk to the course instructor or the college human resource director on your
own.
Summarize using an Engineering Ethics Matrix.
1) Apply the Fundamental Canons: Engineers, in the fulfillment of their professional
duties, shall:
2) Apply the Engineering Ethics Matrix
Options
Canons
a) Do nothing
b) Ask her to
report
c) Confront
student accused
d) Talk to
course instructor
Hold paramount
the safety,
health and
welfare of the
public.
Does not apply
Does not apply
Does not apply
Does not apply
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Copyright ©2015, Elsevier, Inc

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