Question 1

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The emf ε is closest to

Accepted Answer

A)   +3 V.
B)   +19 V.
C)   -3 V.
D)   -10 V.
E)   -1 V.F) B) and C)
G) A) and E)

Question 2

Two light bulbs, B1 and B2, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B1 when we close the switch S? 1 and B2, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B1 when we close the switch S?   A)  The brightness of B1 increases permanently. B)  The brightness of B1 decreases permanently. C)  The brightness of B1 does not change. D)  The brightness of B1 increases temporarily but gradually decreases back to its original brightness. E)  The brightness of B1 decreases temporarily but gradually increases back to its original brightness." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   The brightness of B1 increases permanently.
B)   The brightness of B1 decreases permanently.
C)   The brightness of B1 does not change.
D)   The brightness of B1 increases temporarily but gradually decreases back to its original brightness.
E)   The brightness of B1 decreases temporarily but gradually increases back to its original brightness.F) A) and E)
G) A) and C)

Question 3

A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0. A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal) , what would be the total current flowing through the two wires?

Accepted Answer

A)   4I
B)   2I
C)   I
D)   I/2
E)   I/4F) B) and C)
G) All of the above

Question 4

For the circuit shown in the figure, what is the current through resistor R3? 3?   A)  0.043 A B)  1.5 A C)  0.028 A D)  0.086 A" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.043 A
B)   1.5 A
C)   0.028 A
D)   0.086 AE) A) and D)
F) All of the above

Question 5

A galvanometer with a resistance of 40.0 Ω deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?

Accepted Answer

A)   25 kΩ
B)   27 kΩ
C)   29 kΩ
D)   31 kΩ
E)   35 kΩF) C) and E)
G) B) and E)

Question 6

Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 Ω. When they are connected in parallel, their equivalent resistance is 3.3 Ω. What are the resistances of these resistors?

Accepted Answer

The answer of Two unknown resistors are connected together. When...

Question 7

The resistivity of gold is 2.44 × 10-8 Ω ∙ m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?

Accepted Answer

A)   0.030 mW
B)   0.0076 mW
C)   0.013 mW
D)   0.019 mW
E)   0.025 mWF) C) and D)
G) B) and D)

Question 8

A galvanometer has an internal resistance of 100 Ω and deflects full-scale at a current of 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer?

Accepted Answer

A)   50.0 Ω in series with the galvanometer
B)   50.0 Ω in parallel with the galvanometer
C)   75.0 Ω in parallel with the galvanometer
D)   100 Ω in series with the galvanometer
E)   100 Ω in parallel with the galvanometerF) B) and D)
G) None of the above

Question 9

The emf and the internal resistance of a battery are shown in the figure. If a current of 7.8 A is established through the battery from b to a, what is the terminal voltage Vab of the battery? ab of the battery?   A)  -30 V B)  80 V C)  30 V D)  -80 V E)  zero" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -30 V
B)   80 V
C)   30 V
D)   -80 V
E)   zeroF) A) and B)
G) C) and D)

Question 10

The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 V and 60 W. Assume the resistance of the filament of the bulb is constant and is independent of operating conditions. If the light bulb is operated with a current that is 50% of the current rating of the bulb, what is the actual power drawn by the bulb?

Accepted Answer

A)   10 W
B)   15 W
C)   20 W
D)   25 W
E)   30 WF) A) and B)
G) B) and E)

Question 11

A 6.0-μF capacitor is connected in series with a 5.0 MΩ resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?

Accepted Answer

A)   6.5 μA
B)   2.4 μA
C)   1.3 μA
D)   4.7 μA
E)   9.1 μAF) B) and E)
G) A) and B)

Question 12

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 Ω ∙ m. If the toaster is operated at a voltage of 120 V, how much power does it draw?

Accepted Answer

A)   720 W
B)   700 W
C)   750 W
D)   770 W
E)   800 WF) A) and E)
G) A) and D)

Question 13

For the circuit shown in the figure, determine the current in
(a) the 7.0-Ω resistor.
(b) the 8.0-Ω resistor.
(c) the 4.0-Ω resistor.

Accepted Answer

(a) 1.6 A ...

Question 14

A light bulb is connected in the circuit shown in the figure with the switch S open. All the connecting leads have no appreciable resistance and the battery has no internal resistance. When we close the switch, which statements below accurately describe the behavior of the circuit? (There may be more than one correct choice.)  2 will decrease. E)  The potential drop across R2 will not change." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   The brightness of the bulb will increase.
B)   The brightness of the bulb will decrease.
C)   The brightness of the bulb will not change.
D)   The potential drop across R2 will decrease.
E)   The potential drop across R2 will not change.F) B) and D)
G) B) and C)

Question 15

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S1 and S2 are switches. Which of the following actions would result in the GREATEST amount of current through resistor A? 1 and S2 are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?   A)  closing both switches B)  closing S1 only C)  closing S2 only D)  leaving both switches open as shown." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   closing both switches
B)   closing S1 only
C)   closing S2 only
D)   leaving both switches open as shown.E) B) and C)
F) A) and B)

Question 16

A 400-W computer (including the monitor)  is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?

Accepted Answer

A)   $120
B)   $1200
C)   $15
D)   $17
E)   $150F) A) and E)
G) A) and C)

Question 17

Three resistors having resistances of 4.0 Ω, 6.0 Ω, and 10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor, what is the current through the 10.0-Ω resistor?

Accepted Answer

A)   0.59 A
B)   2.7 A
C)   6.4 A
D)   11.2 A
E)   16 AF) A) and B)
G) None of the above

Question 18

In the figure, when the terminal voltage Vab of the battery is equal to 20 V, how much current passes through the battery, including its direction? ab of the battery is equal to 20 V, how much current passes through the battery, including its direction?   A)  4 A, from a to b B)  5 A, from a to b C)  6 A, from a to b D)  4 A, from b to a E)  5 A, from b to a" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4 A, from a to b
B)   5 A, from a to b
C)   6 A, from a to b
D)   4 A, from b to a
E)   5 A, from b to aF) D) and E)
G) A) and B)

Question 19

For the circuit shown in the figure, what is the current through resistor R1? 1?   A)  0.071 A B)  0.13 A C)  0.029 A D)  0.016 A" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.071 A
B)   0.13 A
C)   0.029 A
D)   0.016 AE) B) and C)
F) A) and D)

Question 20

For the circuit shown in the figure, what current does the ideal ammeter read?

Accepted Answer

A)   0.033 A
B)   0.078 A
C)   0.23 A
D)   0.12 AE) All of the above
F) A) and B)

Exam 28: Fundamentals of Circuits

The resistivity of gold is 2.44 × 10^-8 Ω ∙ m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?

Correct Answer
verified

Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 Ω. When they are connected in parallel, their equivalent resistance is 3.3 Ω. What are the resistances of these resistors?

Correct Answer
verified

For the circuit shown in the figure, determine the current in (a) the 7.0-Ω resistor. (b) the 8.0-Ω resistor. (c) the 4.0-Ω resistor.

Correct Answer
verified
(a) 1.6 A ...
View Answer

For the circuit shown in the figure, what is the current through resistor R₁?

Correct Answer
verified

A 6.0-μF capacitor is connected in series with a 5.0 MΩ resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?

Correct Answer
verified

The emf and the internal resistance of a battery are shown in the figure. If a current of 7.8 A is established through the battery from b to a, what is the terminal voltage V_ab of the battery?

Correct Answer
verified

For the circuit shown in the figure, what current does the ideal ammeter read?

Correct Answer
verified

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The emf ε is closest to

Correct Answer
verified

Two light bulbs, B₁ and B₂, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B₁ when we close the switch S?

Correct Answer
verified

Three resistors having resistances of 4.0 Ω, 6.0 Ω, and 10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor, what is the current through the 10.0-Ω resistor?

Correct Answer
verified

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S₁ and S₂ are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?

Correct Answer
verified

A galvanometer with a resistance of 40.0 Ω deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?

Correct Answer
verified

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m. If the toaster is operated at a voltage of 120 V, how much power does it draw?

Correct Answer
verified

In the figure, when the terminal voltage V_ab of the battery is equal to 20 V, how much current passes through the battery, including its direction?

Correct Answer
verified

A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?

Correct Answer
verified

A galvanometer has an internal resistance of 100 Ω and deflects full-scale at a current of 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For the circuit shown in the figure, what is the current through resistor R₃?

Correct Answer
verified

Exam 28: Fundamentals of Circuits

The resistivity of gold is 2.44 × 10-8 Ω ∙ m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?

Correct AnswerverifiedShow Answer

Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 Ω. When they are connected in parallel, their equivalent resistance is 3.3 Ω. What are the resistances of these resistors?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure, determine the current in (a) the 7.0-Ω resistor. (b) the 8.0-Ω resistor. (c) the 4.0-Ω resistor.

Correct Answerverified(a) 1.6 A ...View AnswerShow Answer

For the circuit shown in the figure, what is the current through resistor R1?

Correct AnswerverifiedShow Answer

A 6.0-μF capacitor is connected in series with a 5.0 MΩ resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?

Correct AnswerverifiedShow Answer

The emf and the internal resistance of a battery are shown in the figure. If a current of 7.8 A is established through the battery from b to a, what is the terminal voltage Vab of the battery?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure, what current does the ideal ammeter read?

Correct AnswerverifiedShow Answer

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The emf ε is closest to

Correct AnswerverifiedShow Answer

Two light bulbs, B1 and B2, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B1 when we close the switch S?

Correct AnswerverifiedShow Answer

Three resistors having resistances of 4.0 Ω, 6.0 Ω, and 10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor, what is the current through the 10.0-Ω resistor?

Correct AnswerverifiedShow Answer

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S1 and S2 are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?

Correct AnswerverifiedShow Answer

A galvanometer with a resistance of 40.0 Ω deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?

Correct AnswerverifiedShow Answer

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 Ω ∙ m. If the toaster is operated at a voltage of 120 V, how much power does it draw?

Correct AnswerverifiedShow Answer

In the figure, when the terminal voltage Vab of the battery is equal to 20 V, how much current passes through the battery, including its direction?

Correct AnswerverifiedShow Answer

A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?

Correct AnswerverifiedShow Answer

A galvanometer has an internal resistance of 100 Ω and deflects full-scale at a current of 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the circuit shown in the figure, what is the current through resistor R3?

Correct AnswerverifiedShow Answer

The resistivity of gold is 2.44 × 10^-8 Ω ∙ m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) 1.6 A ...
View Answer

For the circuit shown in the figure, what is the current through resistor R₁?

Correct Answer
verified

Correct Answer
verified

The emf and the internal resistance of a battery are shown in the figure. If a current of 7.8 A is established through the battery from b to a, what is the terminal voltage V_ab of the battery?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two light bulbs, B₁ and B₂, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B₁ when we close the switch S?

Correct Answer
verified

Correct Answer
verified

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S₁ and S₂ are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?

Correct Answer
verified

Correct Answer
verified

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m. If the toaster is operated at a voltage of 120 V, how much power does it draw?

Correct Answer
verified

In the figure, when the terminal voltage V_ab of the battery is equal to 20 V, how much current passes through the battery, including its direction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For the circuit shown in the figure, what is the current through resistor R₃?

Correct Answer
verified