Question 1

For the circuit shown in the figure,what is the power dissipated in the 2.0-Ω resistor? All the numbers shown are accurate to three significant figures.

Accepted Answer

A)  5.33 W
B)  8.00 W
C)  6.67 W
D)  2.67 W
E)  3.56 W

Question 2

A battery is rated at 12 V and 160 A-h.How much energy does this battery store?

Accepted Answer

A)  1.9 kJ
B)  6.0 kJ
C)  1.9 MJ
D)  6.9 MJ

Question 3

What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)

Accepted Answer

A)  0.013 A
B)  0.31 A
C)  6.3 A
D)  78 A

Question 4

The voltage drop across a metal bar is 
While a current of 
Flows through it.How much power does this bar dissipate?

Accepted Answer

A)  50 mW
B)  500 μW
C)  2.5 kW
D)  0.50 kW

Question 5

A 1500-W heater is connected to a 120-V line for 2.0 hours.How much heat energy is produced?

Accepted Answer

A)  1.5 kJ
B)  3.0 kJ
C)  0.18 MJ
D)  11 MJ

Question 6

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

Accepted Answer

A)  370 W
B)  360 W
C)  380 W
D)  400 W
E)  410 W

Question 7

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10-19C)

Accepted Answer

A)  1.5 × 1019
B)  2.5 × 1019
C)  3.5 × 1019
D)  4.5 × 1019

Question 8

For the circuit shown in the figure,V = 60 V,C = 40 µF,R = 0.90 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.At a given instant after closing the switch,the potential difference across the capacitor is twice the potential difference across the resistor.At that instant,what is the charge on the capacitor?

Accepted Answer

A)  1,600 µC
B)  1,400 µC
C)  1,200 µC
D)  890 µC
E)  600 µC

Question 9

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

Accepted Answer

A)  0.0030 V
B)  0.32 V
C)  0.64 V
D)  1.6 V

Question 10

When two or more different capacitors are connected in series across a potential source,which of the following statements must be true? (There could be more than one correct choice. )

Accepted Answer

A)  The total voltage across the combination is the algebraic sum of the voltages across the individual capacitors.
B)  Each capacitor carries the same amount of charge.
C)  The equivalent capacitance of the combination is less than the capacitance of any of the capacitors.
D)  The potential difference across each capacitor is the same.
E)  The capacitor with the largest capacitance has the most charge.

Question 11

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1? 1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?   A) 0.050 A B) 0.030 A C) 0.00 A D) 2.68 A" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.050 A
B)  0.030 A
C)  0.00 A
D)  2.68 A

Question 12

A resistor,an uncharged capacitor,a dc voltage source,and an open switch are all connected in series.The switch is closed at time t = 0 s.Which one of the following is a correct statement about the circuit?

Accepted Answer

A)  The capacitor charges to its maximum value in one time constant.
B)  The capacitor charges to its maximum value in two time constants.
C)  The potential difference across the resistor is always equal to the potential difference across the capacitor.
D)  Current flows through the circuit even after the capacitor is essentially fully charged.
E)  Once the capacitor is essentially fully charged,there is no current in the circuit.

Question 13

How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

Accepted Answer

A)  20 C
B)  2.0 C
C)  5.0 C
D)  0.050 C

Question 14

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

Accepted Answer

A)  100 Ω
B)  8.0 × 10-3 Ω
C)  6.0 × 10-3 Ω
D)  120 Ω
E)  240 Ω

Question 15

When a potential difference is applied across a piece of wire made of metal A,a -8 Ω ∙ m,and the resistivity of metal B is 1.59 × 10-8 Ω ∙ m. A) 21 mA B) 19 mA C) 11 mA D) 5.3 mA" class="answers-bank-image d-inline" rel="preload" >
Current flows.If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire,how much current will flow through the metal-B wire? The lengths of both wires are the same,and the voltage difference remains unchanged.The resistivity of metal A is 1.68 × 10-8 Ω ∙ m,and the resistivity of metal B is 1.59 × 10-8 Ω ∙ m.

Accepted Answer

A)  21 mA
B)  19 mA
C)  11 mA
D)  5.3 mA

Question 16

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Accepted Answer

A)  0.023 Ω ∙ m
B)  0.015 Ω ∙ m
C)  1.5 × 10-4 Ω ∙ m
D)  2.3 × 10-6 Ω ∙ m

Question 17

What current is flowing in a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

Accepted Answer

A)  2.2 A
B)  0.67 A
C)  0.30 A
D)  0.20 A

Question 18

A 5.0-μF,a 14-μF,and a 21-μF capacitor are connected in series.How much capacitance would a single capacitor need to have to replace the three capacitors?

Accepted Answer

A)  40 μF
B)  3.6 μF
C)  2.0 μF
D)  3.1 μF

Question 19

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current in the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

Accepted Answer

A)  2.25 A
B)  0.75 A
C)  4.5 A
D)  9.5 A
E)  6.4 A

Question 20

For the circuit shown in the figure,V = 20 V,C = 10 µF,R = 0.80 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the potential difference across the resistor 20 s after closing the switch?

Accepted Answer

A)  1.6 V
B)  2.0 V
C)  2.3 V
D)  2.6 V
E)  3.0 V

Exam 21: Electric Current and Direct-Current Circuits

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

Correct Answer
verified

A resistor,an uncharged capacitor,a dc voltage source,and an open switch are all connected in series.The switch is closed at time t = 0 s.Which one of the following is a correct statement about the circuit?

Correct Answer
verified

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10^-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

Correct Answer
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A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Correct Answer
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A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10^-19C)

Correct Answer
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For the circuit shown in the figure,V = 20 V,C = 10 µF,R = 0.80 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the potential difference across the resistor 20 s after closing the switch?

Correct Answer
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A battery is rated at 12 V and 160 A-h.How much energy does this battery store?

Correct Answer
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What current is flowing in a resistor if 4.0 × 10¹⁶ electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10^-19C)

Correct Answer
verified

A 5.0-μF,a 14-μF,and a 21-μF capacitor are connected in series.How much capacitance would a single capacitor need to have to replace the three capacitors?

Correct Answer
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How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

Correct Answer
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Correct Answer
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The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

Correct Answer
verified

What current is flowing in a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

Correct Answer
verified

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current in the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

Correct Answer
verified

Correct Answer
verified

A 1500-W heater is connected to a 120-V line for 2.0 hours.How much heat energy is produced?

Correct Answer
verified

When two or more different capacitors are connected in series across a potential source,which of the following statements must be true? (There could be more than one correct choice. )

Correct Answer
verified

In the circuit shown in the figure,R₁ = 60 Ω,R₂ = 120 Ω,R₃ = 180 Ω,V₁ = 3.0 V,V₂ = 6.0 V,and the batteries are both ideal.What is the current through R₁?

Correct Answer
verified

For the circuit shown in the figure,what is the power dissipated in the 2.0-Ω resistor? All the numbers shown are accurate to three significant figures.

Correct Answer
verified

The voltage drop across a metal bar is While a current of Flows through it.How much power does this bar dissipate?

Correct Answer
verified

Exam 21: Electric Current and Direct-Current Circuits

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

Correct AnswerverifiedShow Answer

A resistor,an uncharged capacitor,a dc voltage source,and an open switch are all connected in series.The switch is closed at time t = 0 s.Which one of the following is a correct statement about the circuit?

Correct AnswerverifiedShow Answer

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

Correct AnswerverifiedShow Answer

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Correct AnswerverifiedShow Answer

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10-19C)

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,V = 20 V,C = 10 µF,R = 0.80 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the potential difference across the resistor 20 s after closing the switch?

Correct AnswerverifiedShow Answer

A battery is rated at 12 V and 160 A-h.How much energy does this battery store?

Correct AnswerverifiedShow Answer

What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)

Correct AnswerverifiedShow Answer

A 5.0-μF,a 14-μF,and a 21-μF capacitor are connected in series.How much capacitance would a single capacitor need to have to replace the three capacitors?

Correct AnswerverifiedShow Answer

How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

Correct AnswerverifiedShow Answer

What current is flowing in a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current in the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 1500-W heater is connected to a 120-V line for 2.0 hours.How much heat energy is produced?

Correct AnswerverifiedShow Answer

When two or more different capacitors are connected in series across a potential source,which of the following statements must be true? (There could be more than one correct choice. )

Correct AnswerverifiedShow Answer

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,what is the power dissipated in the 2.0-Ω resistor? All the numbers shown are accurate to three significant figures.

Correct AnswerverifiedShow Answer

The voltage drop across a metal bar is While a current of Flows through it.How much power does this bar dissipate?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10^-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

Correct Answer
verified

Correct Answer
verified

A 12-V battery is connected across a 100-Ω resistor.How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10^-19C)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What current is flowing in a resistor if 4.0 × 10¹⁶ electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10^-19C)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm.The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m.The toaster is designed to operate at a voltage of 120 V.How much power does it draw in normal operation?

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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In the circuit shown in the figure,R₁ = 60 Ω,R₂ = 120 Ω,R₃ = 180 Ω,V₁ = 3.0 V,V₂ = 6.0 V,and the batteries are both ideal.What is the current through R₁?

Correct Answer
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Correct Answer
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Correct Answer
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