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NAME ______________________________________ DATE _______________ CLASS ____________________
Chapter
HOLT PHYSICS
20 Mixed Review
Circuits and Circuit Elements
1. Consider the circuit shown below.
A
B
C
D
1
3
4
2
5
a. Do any of the bulbs have a complete circuit when all the switches are
open? Which one(s)?
b. Do any of the switches cause a short circuit when closed? Which one(s)?
c. Which switches should be kept open, and which should be closed for
• only bulbs A and B are off
• only bulbs A and C are off
• only bulbs B and C are off
2. A light bulb of unknown resistance is connected in series with a 9.0 Ω
resistor to a 12.0 V battery. The current in the bulb is 0.80 A.
a. In the space below, sketch a schematic diagram of the circuit.
b. Find the equivalent resistance of the circuit.
c. Find the resistance of the light bulb.
108
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the following to occur?
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NAME ______________________________________ DATE _______________ CLASS ____________________
Chapter
HOLT PHYSICS
20 Mixed Review
continued
3. A light bulb of unknown resistance is connected in parallel to a 48.0 Ω
resistor and to a 12.0 V battery. The current through the battery is 2.50 A.
a. In the space below, sketch a schematic diagram of the circuit.
b. Find the potential difference across the resistor and across the bulb.
c. Find the current in the resistor and in the bulb.
HRW material copyrighted under notice appearing earlier in this book.
d. Find the resistance of the light bulb.
4. In the circuit below, find the equivalent resistance for the following
situations.
Ra
Rb
Rc
Re
Rd
Rf
a. Ra = Rb = Rc = Rd = Re = Rf = 10.0 Ω
b. Ra = 10.0 Ω; Rb = 20.0 Ω; Rc = 30.0 Ω; Rd = 40.0 Ω; Re = 50.0 Ω; Rf = 60.0 Ω
Chapter 20
109
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Circuits and Circuit Elements
Chapter 20
Section 20-1, p. 105
1. a. Check student diagrams, which should contain 2
bulbs, 2 resistors, 3 switches, and 1 battery, in a
closed cirucit.
b. Check student diagrams to be certain that the switches
labeled S1 and S2 cause short circuits when closed.
c. Check student diagrams to be certain that switch S3
causes a short circuit when closed.
b. Students should connect one end of B to the battery,
the other to the switch, then the other end of the
switch to the battery. Bulb A should simply be left
out with no connections.
c. Students should connect each end of B to one end of
the battery, the other to the switch, then the other
end of the switch to the battery. Also each end of A
should be connected to an end of the battery.
2. a. Students should connect one end of bulb A to the
battery, the other to the switch, then the other end of
the switch to the battery. Also connect one end of B
to the battery, and the other end of B to the switch.
Section 20-2, p. 106
1. a. 16.0 Ω
2. a. 3.00 Ω
b. 0.750 A for both
c. 4 A, I1 = 1 A; I2 = 3 A
b. 12 V
d. 12.0 V
c. 12.0 V; 9.0 V; 3.0 V
Section 20-3, p. 107
b. Ia = Ib = Ic = 0.600 A; Id = Ie = If = 0.200 A;
∆Va = ∆Vb = ∆Vc = 7.20 V; ∆Vd = ∆Ve = ∆Vf = 2.40 V
III
2. a. Check diagram
b. 54 Ω; Ia = Ib = Ic = If = 0.444 A; Id = Ie = 0.222 A;
∆Va = ∆Vb = ∆Vc = ∆Vf = 5.33 V; ∆Vd = ∆Ve = 2.67 V
Chapter 20 Mixed Review
1. a. D
b. switch 5
c. • switches 1 and 3 open, switches 2, 4, and 5 closed
c. 6 Ω
3. a. Check students diagrams.
• switches 1 and 4 open, switches 2, 3, and 5 closed
b. 12.0 V, 12.0 V
• switch 2 open, switches 1, 3, 4, and 5 closed; or
switches 3 and 4 open, switches 1, 2, and 5 closed;
or switches 2, 3, and 4 open, switches 1 and 5 closed
c. 0.25 A, 2.25 A
2. a. Check students’ diagrams, which should show a
bulb and a resistor in series with a battery.
III–22
b. 15 Ω
Holt Physics Solution Manual
d. 5.33 Ω
4. a. R = 6.15 Ω
b. R = 30.4 Ω
Copyright © by Holt, Rinehart and Winston. All rights reserved.
1. a. 40 Ω