Question 1

Four resistors are connected across an 8-V DC battery as shown in the figure.The current through the 9-Ω resistor is closest to

Accepted Answer

A)  1 A.
B)  0.7 A.
C)  0.5 A.
D)  0.9 A.
E)  2 A.F) B) and E)
G) A) and B)

Question 2

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 E)
G) B) and D)

Question 3

The emf and the internal resistance of a battery are as shown in the figure.If a current of 8.3 A is drawn from the battery when a resistor R is connected across the terminals ab of the battery,what is the power dissipated by the resistor R?

Accepted Answer

A)  440 W
B)  700 W
C)  620 W
D)  530 W
E)  790 WF) A) and C)
G) All of the above

Question 4

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.How long after closing the switch will the current in the resistor be 7.0 µA?

Accepted Answer

A)  87 s
B)  95 s
C)  78 s
D)  69 s
E)  61 sF) A) and B)
G) B) and E)

Question 5

A 4.0-mF capacitor is discharged through a 4.0-kΩ resistor.How long will it take for the capacitor to lose half its initial stored energy?

Accepted Answer

A)  9.2 s
B)  2.7 s
C)  10.2 s
D)  5.5 s
E)  1.6 sF) C) and D)
G) A) and E)

Question 6

A 110-V hair dryer is rated at 1200 W.What current will it draw when operating from a 110-V electrical outlet?

Accepted Answer

A)  90 mA
B)  1.0 A
C)  5.0 A
D)  11 A
E)  14 AF) A) and E)
G) C) and D)

Question 7

When a 100-Ω resistor is connected across the terminals of a battery of emf ε and internal resistance r,the battery delivers 0.794 W of power to the 100-Ω resistor.When the 100-Ω resistor is replaced by a 200-Ω resistor,the battery delivers 0.401 W of power to the 200-Ω resistor.What are the emf and internal resistance of the battery?

Accepted Answer

A)  ε = 10.0 V,r = 5.02 Ω
B)  ε = 4.50 V,r = 4.00 Ω
C)  ε = 9.00 V,r = 2.04 Ω
D)  ε = 9.00 V,r = 1.01 Ω
E)  ε = 12.0 V,r = 6.00 ΩF) All of the above
G) B) and C)

Question 8

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.What is the charge on the capacitor when the current in the circuit is 33 μA?

Accepted Answer

A)  1100 µC
B)  1000 µC
C)  960 µC
D)  890 µC
E)  830 µCF) A) and B)
G) A) and E)

Question 9

A 4.00-Ω resistor,an 8.00-Ω resistor,and a 24.0-Ω resistor are connected together.
(a)What is the maximum resistance that can be produced using all three resistors?
(b)What is the minimum resistance that can be produced using all three resistors?
(c)How would you connect these three resistors to obtain a resistance of 10.0 Ω?
(d)How would you connect these three resistors to obtain a resistance of 8.00 Ω?

Accepted Answer

(a)36.0 Ω (b)2.40 Ω
(c)Connect the 8.00-...

Question 10

A 5.0-Ω resistor and a 9.0-Ω resistor are connected in parallel.A 4.0-Ω resistor is then connected in series with this parallel combination.An ideal 6.0-V battery is then connected across the series-parallel combination of the three resistors.What is the current through
(a)the 4.0-Ω resistor?
(b)the 5.0-Ω resistor?
(c)the 9.0-Ω resistor?

Accepted Answer

(a)0.83 A ...

Question 11

A galvanometer has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA.What size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 mA,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) C) and E)

Question 12

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) A) and C)
F) A) and D)

Question 13

For the circuit shown in the figure,determine the current in
(a)the 1.0-Ω resistor.
(b)the 3.0-Ω resistor.
(c)the 4.0-Ω resistor.

Accepted Answer

(a)2.8 A (...

Question 14

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

Accepted Answer

A)  increases.
B)  decreases.
C)  does not change.D) A) and B)
E) A) and C)

Question 15

A certain electric furnace consumes 24 kW when it is connected to a 240-V line.What is the resistance of the furnace?

Accepted Answer

A)  1.0 kΩ
B)  10 Ω
C)  2.4 Ω
D)  0.42 Ω
E)  100 ΩF) B) and E)
G) A) and B)

Question 16

The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals.What happens to the brightness of lightbulb 1 when the switch S is closed?

Accepted Answer

A)  The brightness will increase momentarily then return to its previous level.
B)  The brightness increases permanently.
C)  The brightness will decrease momentarily then return to its previous level.
D)  The brightness remains the same as before the switch is closed.
E)  The brightness decreases permanently.F) A) and B)
G) C) and D)

Question 17

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) C) and D)
G) C) and E)

Question 18

An RC circuit is connected across an ideal DC voltage source through an open switch.The switch is closed at time t = 0 s.Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

Accepted Answer

A)  The capacitor charges to its maximum value in one time constant and the current is zero at that time.
B)  The potential difference across the resistor and the potential difference across the capacitor are always equal.
C)  The potential difference across the resistor is always greater than the potential difference across the capacitor.
D)  The potential difference across the capacitor is always greater than the potential difference across the resistor
E)  Once the capacitor is essentially fully charged,there is no appreciable current in the circuit.F) C) and D)
G) B) and C)

Question 19

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) B) and C)
G) None of the above

Question 20

In the circuit shown in the figure,all the lightbulbs are identical.Which of the following is the correct ranking of the brightness of the bulbs?

Accepted Answer

A)  B and C have equal brightness,and A is the dimmest.
B)  A and B have equal brightness,and C is the dimmest.
C)  A is brightest,C is dimmest,and B is in between.
D)  A is the brightest,and B and C have equal brightness but less than A.
E)  All three bulbs have the same brightness.F) All of the above
G) A) and B)

Exam 28: Fundamentals of Circuits

In the circuit shown in the figure,all the lightbulbs are identical.Which of the following is the correct ranking of the brightness of the bulbs?

Correct Answer
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A galvanometer has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA.What size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 mA,and how should this resistor be connected to the galvanometer?

Correct Answer
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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
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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
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A 4.0-mF capacitor is discharged through a 4.0-kΩ resistor.How long will it take for the capacitor to lose half its initial stored energy?

Correct Answer
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For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.How long after closing the switch will the current in the resistor be 7.0 µA?

Correct Answer
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For the circuit shown in the figure,determine the current in (a)the 1.0-Ω resistor. (b)the 3.0-Ω resistor. (c)the 4.0-Ω resistor.

Correct Answer
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(a)2.8 A (...
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Correct Answer
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(a)0.83 A ...
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For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.What is the charge on the capacitor when the current in the circuit is 33 μA?

Correct Answer
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Four resistors are connected across an 8-V DC battery as shown in the figure.The current through the 9-Ω resistor is closest to

Correct Answer
verified

A certain electric furnace consumes 24 kW when it is connected to a 240-V line.What is the resistance of the furnace?

Correct Answer
verified

An RC circuit is connected across an ideal DC voltage source through an open switch.The switch is closed at time t = 0 s.Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

Correct Answer
verified

A 110-V hair dryer is rated at 1200 W.What current will it draw when operating from a 110-V electrical outlet?

Correct Answer
verified

The emf and the internal resistance of a battery are as shown in the figure.If a current of 8.3 A is drawn from the battery when a resistor R is connected across the terminals ab of the battery,what is the power dissipated by the resistor R?

Correct Answer
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The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals.What happens to the brightness of lightbulb 1 when the switch S is closed?

Correct Answer
verified

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

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
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Correct Answer
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Correct Answer
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(a)36.0 Ω (b)2.40 Ω
(c)Connect the 8.00-...
View 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 Answer
verified

Exam 28: Fundamentals of Circuits

In the circuit shown in the figure,all the lightbulbs are identical.Which of the following is the correct ranking of the brightness of the bulbs?

Correct AnswerverifiedShow Answer

A galvanometer has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA.What size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 mA,and how should this resistor be connected to the galvanometer?

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

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 4.0-mF capacitor is discharged through a 4.0-kΩ resistor.How long will it take for the capacitor to lose half its initial stored energy?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.How long after closing the switch will the current in the resistor be 7.0 µA?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,determine the current in (a)the 1.0-Ω resistor. (b)the 3.0-Ω resistor. (c)the 4.0-Ω resistor.

Correct Answerverified(a)2.8 A (...View AnswerShow Answer

Correct Answerverified(a)0.83 A ...View AnswerShow Answer

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.What is the charge on the capacitor when the current in the circuit is 33 μA?

Correct AnswerverifiedShow Answer

Four resistors are connected across an 8-V DC battery as shown in the figure.The current through the 9-Ω resistor is closest to

Correct AnswerverifiedShow Answer

A certain electric furnace consumes 24 kW when it is connected to a 240-V line.What is the resistance of the furnace?

Correct AnswerverifiedShow Answer

An RC circuit is connected across an ideal DC voltage source through an open switch.The switch is closed at time t = 0 s.Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

Correct AnswerverifiedShow Answer

A 110-V hair dryer is rated at 1200 W.What current will it draw when operating from a 110-V electrical outlet?

Correct AnswerverifiedShow Answer

The emf and the internal resistance of a battery are as shown in the figure.If a current of 8.3 A is drawn from the battery when a resistor R is connected across the terminals ab of the battery,what is the power dissipated by the resistor R?

Correct AnswerverifiedShow Answer

The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals.What happens to the brightness of lightbulb 1 when the switch S is closed?

Correct AnswerverifiedShow Answer

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

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

Correct AnswerverifiedShow Answer

Correct Answerverified(a)36.0 Ω (b)2.40 Ω(c)Connect the 8.00-...View AnswerShow 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

Correct Answer
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Correct Answer
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Correct Answer
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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
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Correct Answer
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Correct Answer
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Correct Answer
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(a)2.8 A (...
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Correct Answer
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(a)0.83 A ...
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Correct Answer
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Correct Answer
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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
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Correct Answer
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Correct Answer
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(a)36.0 Ω (b)2.40 Ω
(c)Connect the 8.00-...
View Answer

Correct Answer
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