west (mrw3223) – HW 26 – lyle – (16001)
This print-out should have 37 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
Reading assignment: Hecht Sections 18-1,
18-2, 18-3 and 18-5
001 10.0 points
Kirchhoff’s loop rule for circuit analysis is an
expression of which of the following?
1. Conservation of energy
2. Ohm’s law
3. Amp`ere’s law
4. Faraday’s law
5. Conservation of charge
002 10.0 points
A battery having an emf of 11.61 V delivers
108 mA when connected to a 60.8 Ω load.
Find the internal resistance of the battery.
Answer in units of Ω.
003 10.0 points
When you turn the ignition key in a car, you
complete a circuit from the negative battery
terminal through the electric starter and back
to the positive battery terminal.
About how long does it take electrons starting from the negative terminal to reach the
positive terminal? 1 string dissipates 63 W.
What is the equivalent resistance of the
light string?
Answer in units of Ω.
005 (part 2 of 5) 10.0 points
What is the resistance of a single light?
Answer in units of Ω.
006 (part 3 of 5) 10.0 points
What power is dissipated in a single light?
Answer in units of W.
007 (part 4 of 5) 10.0 points
One of the bulbs burns out. The lamp has a
wire that shorts out the bulb filament when it
burns out, dropping the resistance of the bulb
to zero.
What is the resistance Rnew of the light
string now?
Answer in units of Ω.
008 (part 5 of 5) 10.0 points
Find the power Pnew dissipated by the string
now.
Answer in units of W.
009 (part 1 of 2) 10.0 points
Two identical light bulbs A and B are connected in series to a constant voltage source.
Suppose a wire is connected across bulb B as
shown. A 1. several minutes E B 2. less than human reflex time
Bulb A
3. 1/2 second
1. will burn twice as brightly as before.
4. several seconds
2. will burn half as brightly as before.
5. several hours
004 (part 1 of 5) 10.0 points
A string of 26 identical Christmas tree lights
are connected in series to a 120 V source. The 3. will burn nearly four times as brightly as
before.
4. will burn as brightly as before. west (mrw3223) – HW 26 – lyle – (16001) 4. It is different for each connection, but one
must know the values of E to know which is
greater. 4. will burn half as brightly as before. Consider resistors R1 and R2 connected in
series
R1
R2 013 10.0 points
The following diagram shows part of an electrical circuit.
7Ω
26 Ω
A
36 Ω E b
What is the equivalent resistance between
the points a and b ?
Answer in units of Ω. and in parallel
R1 21 Ω 10.0 points 24.2 Ω 33 Ω 5. will burn as brightly as before. 12.1 Ω 3. will burn nearly four times as brightly as
before. Ω 2. will go out. 012 10.0 points
Consider the circuit
a
12.1 Ω .2 1. will burn twice as brightly as before. 5. It is the same for both connections 24 010 (part 2 of 2) 10.0 points
and bulb B 24.2 Ω 5. will go out. 011 2 14 Ω 41 Ω B
R2
E Find the equivalent resistance Req between
points A and B of the resistor network.
Answer in units of Ω.
014 to a source of emf E that has no internal
resistance.
How does the power dissipated by the resistors in these two cases compare? 10.0 points Consider the circuit
6Ω
13.3 Ω 1. It is different for each connection, but one
must know the values of R1 and R2 to know
which is greater.
2. It is greater for the series connection.
3. It is greater for the parallel connection. 13 Ω 7.4 Ω I 49 V S Find the equivalent resistance. west (mrw3223) – HW 26 – lyle – (16001)
Answer in units of Ω.
015 3 Consider the circuit. 10.0 points
23.7 Ω Consider the circuit
9.1 Ω 1.4 Ω 0.25 A
4.6 Ω 2.8 Ω 2.7 Ω 34 V 5.6 Ω 3.5 Ω Find the equivalent resistance.
Answer in units of Ω.
016 (part 1 of 2) 10.0 points
The power supplied to the circuit is 9.85 W.
13.7 Ω
3.88 Ω
6.15 Ω E a S b At what rate is heat being generated in the
2.7 Ω resistor on the right?
Answer in units of W.
020 (part 1 of 3) 10.0 points
A battery with an internal resistance is connected to two resistors in series.
16 Ω
20 Ω 2.79 Ω
E
0.3 A E 2.66 Ω X
Find the equivalent resistance of the circuit.
Answer in units of Ω. 4Ω
internal
resistance Y What is the emf E of the battery?
1. E = 6.0 V 017 (part 2 of 2) 10.0 points
Find the emf across the battery.
Answer in units of V.
018 10.0 points
Find the equivalent resistance between points
a and b in the figure.
ab 2.4 Ω 2.8 Ω 2.5 Ω
b 2.6 Ω 2. E = 10.8 V
3. E = 13.2 V
4. E = 12.0 V
5. E = 1.2 V
021 (part 2 of 3) 10.0 points
What is the potential difference across the
terminals Y and X of the battery? 4.2 Ω b
Answer in units of Ω.
019 10.0 points 1. VY X = 1.2 V
2. VY X = 6.0 V
3. VY X = 10.8 V west (mrw3223) – HW 26 – lyle – (16001) 4 5. PD > PB = PC > PA
4. VY X = 13.2 V
6. PA > PB = PC > PD
5. VY X = 12.0 V
022 (part 3 of 3) 10.0 points
What power Pinternal is dissipated by the 4 Ω
internal resistance of the battery? 024 (part 2 of 4) 10.0 points
If the emf of the battery is 15 V and each
resistance is 4 Ω, what power is consumed by
bulb B?
Answer in units of W. 1. Pinternal = 3.6 W
025 (part 3 of 4) 10.0 points
Bulb D is then removed from its socket.
How does the brightness of bulb A change? 2. Pinternal = 0.36 W
3. Pinternal = 1.2 W 1. The brightness of bulb A cannot be determined. 4. Pinternal = 3.2 W
5. Pinternal = 4.8 W 2. The brightness of bulb A remains the
same. 023 (part 1 of 4) 10.0 points
3. The brightness of bulb A increases.
In the circuit shown below, A, B, C, and D
are identical light bulbs.
Assume that the battery maintains a constant potential difference between its terminals (i.e., the internal resistance of the battery
is assumed to be negligible) and the resistance
of each lightbulb remains constant. 4. The brightness of bulb A decreases.
026 (part 4 of 4) 10.0 points
How does the brightness of bulb B change
when bulb D is removed from its socket?
1. The brightness of bulb B remains the
same.
2. The brightness of bulb B cannot be determined. B E D 3. The brightness of bulb B increases. A C
What is the correct relationship for the
brightnesses of (the power consumed by) the
light bulbs?
1. PB = PC > PA > PD
2. PA > PB > PC > PD
3. PD > PA > PB = PC
4. PA > PD > PB = PC 4. The brightness of bulb B decreases.
027 (part 1 of 2) 10.0 points
The following diagram shows part of a
closed electrical circuit. west (mrw3223) – HW 26 – lyle – (16001)
12 Ω 23 Ω X 5 1. the same everywhere in the circuit.
Y
2. greater at point X than at point Y . 14 Ω
E 3. greater in the 21 Ω resistor than in the
28 Ω resistor. I
Find the electric resistance RXY of the part
of the circuit shown between point X and Y .
Answer in units of Ω.
028 (part 2 of 2) 10.0 points
When there is a steady current in the circuit,
the amount of charge passing a point per unit
time is
1. greater in the 14 Ω resistor than in the
23 Ω resistor.
2. greater in the 12 Ω resistor than in the
14 Ω resistor. 4. greater in the 28 Ω resistor than in the
13 Ω resistor.
5. greater in the 21 Ω resistor than in the
13 Ω resistor.
031 10.0 points Which of the following combinations of resistors would dissipate 900 W when connected
to a 240 V power supply?
80 Ω
1. 80 Ω 3. the same everywhere in the circuit.
4. greater in the 12 Ω resistor than in the
23 Ω resistor. 2. 3. 5. greater at point X than at point Y . 24 Ω 40 Ω 16 Ω 48 Ω
64 Ω 029 (part 1 of 2) 10.0 points 48 Ω The following diagram shows part of a
closed electrical circuit.
21 Ω
X 13 Ω 4. 24 Ω
48 Ω
72 Ω Y
28 Ω 72 Ω 5. 72 Ω E
I
Find the electric resistance RXY of the part
of the circuit shown between point X and Y .
Answer in units of Ω.
030 (part 2 of 2) 10.0 points
When there is a steady current in the circuit,
the amount of charge passing a point per unit
time is 6. 24 Ω 16 Ω 32 Ω 032 (part 1 of 2) 10.0 points
In the figure below the switch S is initially
in position a . west (mrw3223) – HW 26 – lyle – (16001) b c b R3 8.6 Ω S bb Ω V b .2 a 17 R1 Consider the resistor network shown.
8.6 Ω b 19 V b 6 R2
8.6 Ω b What happens to the current through R3
when the switch is moved to the open position
b? R1 = R2 = R3 . Neglect the internal
resistance of the battery. At what rate is thermal energy being generated in the 17.2 Ω resistor in the center of
the circuit?
Answer in units of W. 1. The current through R3 increases to
three-halves its original value. 035 (part 1 of 2) 10.0 points 2. The current through R3 increases to twice
its original value. Consider the following circuit
3.5 Ω 3. The current through R3 is reduced to
one-half its original value.
4. The current through R3 remains the
same.
5. The current through R3 decreases to twothirds its original value.
033 (part 2 of 2) 10.0 points
What happens when switch S is moved to
position c, leaving R2 and R3 parallel?
1. The current through R2 and R3 are now
the same.
2. The current through R3 decreases.
3. The current through R3 increases.
4. The current through R2 remains the same
as when R1 was in the circuit.
5. The current through R2 is half what it
was with R1 in the circuit.
034 10.0 points 3Ω 26 V 1Ω What is the current through the lower resistor?
Answer in units of A.
036 (part 2 of 2) 10.0 points
What is the current through the middle (3 Ω)
resistor?
Answer in units of A.
037 10.0 points
Please note that the uppermost 1 ohm resistor
shown in the schematic is the internal resistance of the battery, not a separate resistor in
the circuit.
In the figure below the battery has an emf of
6 V and an internal resistance of 1 Ω . Assume
there is a steady current flowing in the circuit. west (mrw3223) – HW 26 – lyle – (16001)
6V
1Ω 10 Ω 7Ω
2 µF Find the charge on the 2 µF capacitor.
Answer in units of µC. 7

 

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