Question 1

A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?

Accepted Answer

A)   1.5 kJ
B)   3.0 kJ
C)   0.18 MJ
D)   11 MJ
E)   18 MJF) B) and C)
G) A) and B)

Question 2

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

Question 3

Two cables of the same length are made of the same material,except that one cable has twice the diameter of the other cable.When the same potential difference is maintained across both cables,which of the following statements are true? (There may be more than one correct choice.)

Accepted Answer

A)   The same current flows through both cables.
B)   Both cables carry the same current density.
C)   The electrons have the same drift velocity in both cables.
D)   The current in the thin cable is twice as great as the current in the thick cable.
E)   The current in the thin cable is four times as great as the current in the thick cable.F) None of the above
G) B) and E)

Question 4

Three resistors are connected across an ideal 2.0-V DC battery as shown in the figure.
(a)At what rate does the battery supply energy to the resistors?
(b)At what rate is heat produced in the 6.0-Ω resistor?

Accepted Answer

The answer of Three resistors are connected across an ideal...

Question 5

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 6

In the circuit shown in the figure,an ideal ohmmeter is connected across ab with the switch S open.All the connecting leads have negligible resistance.The reading of the ohmmeter will be closest to

Accepted Answer

A)   7.5 Ω.
B)   10 Ω.
C)   30 Ω.
D)   40 Ω.
E)   60 Ω.F) B) and E)
G) A) and B)

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) C) and D)

Question 8

For the circuit shown in the figure,the current in the 8-Ω resistor is 0.50 A,and all quantities are accurate to 2 significant figures.What is the current in the 2-Ω resistor?

Accepted Answer

A)   2.25 A
B)   0.75 A
C)   4.5 A
D)   9.5 A
E)   6.4 AF) All of the above
G) D) and E)

Exam 31: Electric Circuits

Two cables of the same length are made of the same material,except that one cable has twice the diameter of the other cable.When the same potential difference is maintained across both cables,which of the following statements are true? (There may be more than one correct choice.)

Correct Answer
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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
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(a)1.6 A
...
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In the circuit shown in the figure,an ideal ohmmeter is connected across ab with the switch S open.All the connecting leads have negligible resistance.The reading of the ohmmeter will be closest to

Correct Answer
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Correct Answer
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For the circuit shown in the figure,the current in the 8-Ω resistor is 0.50 A,and all quantities are accurate to 2 significant figures.What is the current in the 2-Ω resistor?

Correct Answer
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A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?

Correct Answer
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Three resistors are connected across an ideal 2.0-V DC battery as shown in the figure. (a)At what rate does the battery supply energy to the resistors? (b)At what rate is heat produced in the 6.0-Ω resistor?

Correct Answer
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Correct Answer
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Exam 31: Electric Circuits

Two cables of the same length are made of the same material,except that one cable has twice the diameter of the other cable.When the same potential difference is maintained across both cables,which of the following statements are true? (There may be more than one correct choice.)

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

In the circuit shown in the figure,an ideal ohmmeter is connected across ab with the switch S open.All the connecting leads have negligible resistance.The reading of the ohmmeter will be closest to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,the current in the 8-Ω resistor is 0.50 A,and all quantities are accurate to 2 significant figures.What is the current in the 2-Ω resistor?

Correct AnswerverifiedShow Answer

A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?

Correct AnswerverifiedShow Answer

Three resistors are connected across an ideal 2.0-V DC battery as shown in the figure. (a)At what rate does the battery supply energy to the resistors? (b)At what rate is heat produced in the 6.0-Ω resistor?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

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

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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