Question 1

A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10-19 C)

Accepted Answer

A)   0.20
B)   20
C)   2.0
D)   3.1 x  102010^{20}1020 
E)   31 x  102010^{20}1020F) A) and C)
G) B) and E)

Question 2

Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the diameter of the other. How do the resistances of these two wires compare?

Accepted Answer

A)   The thicker wire has 1/3 the resistance of the thinner wire.
B)   The thicker wire has 1/9 the resistance of the thinner wire.
C)   The thicker wire has 3 times the resistance of the thinner wire.
D)   The thicker wire has 9 times the resistance of the thinner wire.
E)   The thicker wire has  3\sqrt { 3 }3c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​  times the resistance of the thinner wire. F) A) and D)
G) A) and C)

Question 3

The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

Accepted Answer

A)   It is increased by a factor of 2.
B)   It is increased by a factor of 4.
C)   It is reduced by a factor of 2.
D)   It is reduced by a factor of 4.
E)   It is reduced by a factor of 8.F) B) and E)
G) B) and D)

Question 4

A light bulb operating at a dc voltage of 120 V has a resistance of 200 Ω. How much power is dissipated in this bulb?

Accepted Answer

A)   100 W
B)   60 W
C)   72 W
D)   14 mW
E)   7.2 WF) All of the above
G) A) and C)

Question 5

A 4000-Ω resistor is connected across a 220-V power source. What current will flow through the resistor?

Accepted Answer

A)   0.055 A
B)   1.8 A
C)   5.5 A
D)   18 AE) None of the above
F) C) and D)

Question 6

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 MJE) All of the above
F) A) and B)

Question 7

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W. How much current is flowing through this bulb?

Accepted Answer

A)   1.5 A
B)   2.5 A
C)   0.50 A
D)   2.0 A
E)   1.0 AF) C) and D)
G) B) and D)

Question 8

The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?

Accepted Answer

A)   the cross-sectional area of the wire
B)   the resistivity of the material of which the wire is made
C)   the product of the resistivity and the cross-sectional area of the wire
D)   the resistivity of the material divided by the cross-sectional area of the wire
E)   the reciprocal of the resistivity of the materialF) B) and D)
G) A) and B)

Question 9

If a quantity you calculated has units of  kg⋅m3 s⋅C2\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } } s⋅C2kg⋅m3​  what is that quantity?

Accepted Answer

A)   potential
B)   resistivity
C)   resistance
D)   capacitance
E)   current F) All of the above
G) A) and E)

Question 10

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 × 10-19 C)

Accepted Answer

A)   1.5 × 1019
B)   2.5 × 1019
C)   3.5 × 1019
D)   4.5 × 1019E) A) and C)
F) None of the above

Question 11

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device?

Accepted Answer

The answer of The graph shown in the figure shows...

Question 12

If the power rating of a 400-Ω resistor is 0.80 W, what is the maximum current it can safely draw?

Accepted Answer

A)   45 mA
B)   18 mA
C)   4.4 mA
D)   2.0 mA
E)   320 mAF) A) and B)
G) None of the above

Question 13

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

Accepted Answer

A)   power
B)   resistivity
C)   1/(resistivity) 
D)   resistance
E)   1/(resistance) F) A) and B)
G) C) and D)

Question 14

What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 Ω ∙ m?

Accepted Answer

A)   0.0063 Ω
B)   0.0080 Ω
C)   0.80 Ω
D)   6.3 ΩE) A) and D)
F) None of the above

Question 15

The power rating of a 400-Ω resistor is 0.800 W.
(a) What is the maximum safe voltage across this resistor?
(b) What is the maximum current the resistor can safely draw?

Accepted Answer

(a) 17.9 V...

Question 16

Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?

Accepted Answer

A)   The resistance of wire #1 is twice as high as that of wire #2.
B)   The resistance of wire #1 is equal to that of wire #2.
C)   The resistance of wire #1 is half that of wire #2.
D)   The resistance of wire #1 is four times higher than that of wire #2.E) None of the above
F) All of the above

Question 17

Which one of the following quantities is equivalent to 1 W?

Accepted Answer

A)   1 V/A
B)   1 Ω ∙ m
C)   1 V ∙ A
D)   1 V/Ω
E)   1 A ∙ sF) C) and E)
G) None of the above

Question 18

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device?

Accepted Answer

The answer of The graph shown in the figure shows...

Question 19

If a quantity you calculated has units of A ∙ s, what is that quantity?

Accepted Answer

A)   potential
B)   resistivity
C)   resistance
D)   capacitance
E)   chargeF) A) and B)
G) B) and C)

Question 20

If a quantity you calculated has units of Ω ∙ m what is that quantity?

Accepted Answer

A)   potential
B)   resistivity
C)   resistance
D)   capacitance
E)   chargeF) A) and B)
G) C) and D)

Exam 22: Current and Resistance

If a quantity you calculated has units of kg⋅m3 s⋅C2\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } } s⋅C2kg⋅m3​ what is that quantity?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A light bulb operating at a dc voltage of 120 V has a resistance of 200 Ω. How much power is dissipated in this bulb?

Correct AnswerverifiedShow Answer

The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

Correct AnswerverifiedShow Answer

A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10-19 C)

Correct AnswerverifiedShow Answer

If a quantity you calculated has units of Ω ∙ m what is that quantity?

Correct AnswerverifiedShow Answer

A 4000-Ω resistor is connected across a 220-V power source. What current will flow through the resistor?

Correct AnswerverifiedShow Answer

If a quantity you calculated has units of A ∙ s, what is that quantity?

Correct AnswerverifiedShow Answer

The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?

Correct AnswerverifiedShow Answer

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device?

Correct AnswerverifiedShow Answer

If the power rating of a 400-Ω resistor is 0.80 W, what is the maximum current it can safely draw?

Correct AnswerverifiedShow Answer

Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the diameter of the other. How do the resistances of these two wires compare?

Correct AnswerverifiedShow Answer

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device?

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 × 10-19 C)

Correct AnswerverifiedShow Answer

What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 Ω ∙ m?

Correct AnswerverifiedShow Answer

The power rating of a 400-Ω resistor is 0.800 W. (a) What is the maximum safe voltage across this resistor? (b) What is the maximum current the resistor can safely draw?

Correct Answerverified(a) 17.9 V...View AnswerShow Answer

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

Correct AnswerverifiedShow Answer

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W. How much current is flowing through this bulb?

Correct AnswerverifiedShow Answer

Which one of the following quantities is equivalent to 1 W?

Correct AnswerverifiedShow Answer

Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?

Correct AnswerverifiedShow Answer

If a quantity you calculated has units of $\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } }$ what is that quantity?

Correct Answer
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A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10^-19C)

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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^-¹⁹ C)

Correct Answer
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What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10^-8 Ω ∙ m?

Correct Answer
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(a) 17.9 V...
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