Question 1

For the circuit shown in the figure, all quantities are accurate to 3 significant figures. What is the power dissipated in the 2-Ω resistor?

Accepted Answer

A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W 
A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W

Question 2

A galvanometer G has an internal resistance rg. An AMMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the ammeter?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 3

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The current I1 is closest to

Accepted Answer

A)  zero. 
B)  +0.2 A. 
C)  +0.4 A. 
D)  -0.2 A. 
E)  -0.4 A. 
A)  zero. 
B)  +0.2 A. 
C)  +0.4 A. 
D)  -0.2 A. 
E)  -0.4 A.

Question 4

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?

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 a 
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

Question 5

The power rating of a 400-Ω resistor is 0.800 W.
(a) What is the maximum voltage that can be applied across this resistor without damaging it?
(b) What is the maximum current this resistor can draw without damaging it?

Accepted Answer

(a) 17.9 V

Question 6

What is the maximum current that can be drawn from a 1.50-V battery with an internal resistance of 0.30 ohm?

Accepted Answer

A)  2.5 A 
B)  5.0 A 
C)  0.45 A 
D)  0.20 A 
E)  4.5 A 
A)  2.5 A 
B)  5.0 A 
C)  0.45 A 
D)  0.20 A 
E)  4.5 A

Question 7

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

Question 8

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I2 is closest to

Accepted Answer

A)  -6 A. 
B)  6 A. 
C)  8 A. 
D)  -8 A. 
E)  zero. 
A)  -6 A. 
B)  6 A. 
C)  8 A. 
D)  -8 A. 
E)  zero.

Question 9

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage Vab is equal to 17.4 V, what is the current through the battery, including its direction?

Accepted Answer

A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a 
A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a

Question 10

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. 
A)  increases. 
B)  decreases. 
C)  does not change.

Question 11

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?

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. 
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.

Question 12

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

(a) 3.0 W

Question 13

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/4 
A)  4I 
B)  2I 
C)  I 
D)  I/2 
E)  I/4

Question 14

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

Question 15

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. 
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.

Question 16

For the circuit shown in the figure, I = 0.50 A and R = 12 Ω. What is the value of the emf ε?

Accepted Answer

A)  18 V 
B)  24 V 
C)  6.0 V 
D)  12 V 
E)  48 V 
A)  18 V 
B)  24 V 
C)  6.0 V 
D)  12 V 
E)  48 V

Question 17

Thirteen resistors are connected across points A and B as shown in the figure. If all the resistors are accurate to 2 significant figures, what is the equivalent resistance between points A and B?

Accepted Answer

A)  4.0 Ω 
B)  6.0 Ω 
C)  8.0 Ω 
D)  10 Ω 
E)  12 Ω 
A)  4.0 Ω 
B)  6.0 Ω 
C)  8.0 Ω 
D)  10 Ω 
E)  12 Ω

Question 18

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. 
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.

Question 19

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

Question 20

A galvanometer G has an internal resistance rg. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Exam 31: Fundamentals of Circuits

For the circuit shown in the figure, all quantities are accurate to 3 significant figures. What is the power dissipated in the 2-Ω resistor?

A galvanometer G has an internal resistance rg. An AMMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the ammeter?

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The current I1 is closest to

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?

The power rating of a 400-Ω resistor is 0.800 W. (a) What is the maximum voltage that can be applied across this resistor without damaging it? (b) What is the maximum current this resistor can draw without damaging it?

What is the maximum current that can be drawn from a 1.50-V battery with an internal resistance of 0.30 ohm?

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

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I2 is closest to

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage Vab is equal to 17.4 V, what is the current through the battery, including its direction?

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

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?

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?

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

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.)

For the circuit shown in the figure, I = 0.50 A and R = 12 Ω. What is the value of the emf ε?

Thirteen resistors are connected across points A and B as shown in the figure. If all the resistors are accurate to 2 significant figures, what is the equivalent resistance between points A and B?

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?

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?

A galvanometer G has an internal resistance rg. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics Ii: Motion in a Plane

Impulse and Momentum

Energy

Work

Rotation of a Rigid Body

Newtons Theory of Gravity

Oscillations

Fluids and Elasticity

A Macroscopic Description of Matter

Work, Heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Traveling Waves

Superpositions

Wave Optics

Ray Optics

Optical Instruments

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Ac Circuits

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Nuclear Physics

Filters

A galvanometer G has an internal resistance r_g. An AMMETER is constructed by incorporating the galvanometer and an additional resistance R_s. Which one of the figures below is the most appropriate circuit diagram for the ammeter?

A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The current I₁ is closest to

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?

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I₂ is closest to

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage V_ab is equal to 17.4 V, what is the current through the battery, including its direction?

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?

A galvanometer G has an internal resistance r_g. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance R_s. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?