Question 1

What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.

Accepted Answer

A) 950 Ω 
B) 450 Ω 
C) 392 Ω 
D) 257 Ω 
A) 950 Ω 
B) 450 Ω 
C) 392 Ω 
D) 257 Ω

Question 2

Consider two copper wires of equal length.One wire has twice the cross-sectional area of the other.How do the resistances of these two wires compare?

Accepted Answer

A) The thicker wire has twice the resistance of the thinner wire. 
B) The thicker wire has eight times the resistance of the thinner wire. 
C) The thicker wire has one-half the resistance of the thinner wire. 
D) The thicker wire has four times the resistance of the thinner wire. 
E) The thicker wire has one-fourth the resistance of the thinner wire. 
A) The thicker wire has twice the resistance of the thinner wire. 
B) The thicker wire has eight times the resistance of the thinner wire. 
C) The thicker wire has one-half the resistance of the thinner wire. 
D) The thicker wire has four times the resistance of the thinner wire. 
E) The thicker wire has one-fourth the resistance of the thinner wire.

Question 3

For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

Accepted Answer

A) 1/(resistance) 
B) resistance 
C) potential 
D) (potential)2 
E) 1/(potential) 
A) 1/(resistance) 
B) resistance 
C) potential 
D) (potential)2 
E) 1/(potential)

Question 4

What potential difference is required to cause 4.00 A of current through a resistance of 330 Ω?

Accepted Answer

A) 12.1 V 
B) 82.5 V 
C) 334 V 
D) 1320 V 
A) 12.1 V 
B) 82.5 V 
C) 334 V 
D) 1320 V

Question 5

The figure shows conventional current through a resistor.The arrow shows the direction of this conventional current.Which of the following statements are correct? (There could be more than one correct choice.)

Accepted Answer

A) The charges are moving slower at point b than at point a. 
B) The electric potential is lower at point b than at point a. 
C) The electric potential is higher at point b than at point a. 
D) The current at point b is the same as the current at point a. 
E) The electric potential at point b is the same as it is at point a. 
A) The charges are moving slower at point b than at point a. 
B) The electric potential is lower at point b than at point a. 
C) The electric potential is higher at point b than at point a. 
D) The current at point b is the same as the current at point a. 
E) The electric potential at point b is the same as it is at point a.

Question 6

What is the magnitude of the potential difference between points A and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Accepted Answer

A) 6.0 V 
B) 4.0 V 
C) 3.0 V 
D) 2.0 V 
A) 6.0 V 
B) 4.0 V 
C) 3.0 V 
D) 2.0 V

Question 7

Consider two copper wires of equal cross-sectional area.One wire has 3 times the length of the other.How do the resistances of these two wires compare?

Accepted Answer

A) Both wires have the same resistance. 
B) The longer wire has 1/3 the resistance of the shorter wire. 
C) The longer wire has 3 times the resistance of the shorter wire. 
D) The longer wire has 9 times times the resistance of the shorter wire. 
E) The longer wire has 27 times times the resistance of the shorter wire. 
A) Both wires have the same resistance. 
B) The longer wire has 1/3 the resistance of the shorter wire. 
C) The longer wire has 3 times the resistance of the shorter wire. 
D) The longer wire has 9 times times the resistance of the shorter wire. 
E) The longer wire has 27 times times the resistance of the shorter wire.

Question 8

Two 100-W light bulbs of fixed resistance are to be connected to an ideal 120-V source.What are the current,potential difference,and dissipated power for each bulb when they are connected
(a)in parallel (the normal arrangement)?
(b)in series?

Accepted Answer

(a)0.83 A in each; 120 V for e

Question 9

Each of the resistors shown in the figure has a resistance of $180.0 \Omega$ What is the equivalent resistance between points a and b of this combination?

Accepted Answer

A) 450.0 Ω 
B) 720.0 Ω 
C) 540.0 Ω 
D) 180.0 Ω 
A) 450.0 Ω 
B) 720.0 Ω 
C) 540.0 Ω 
D) 180.0 Ω

Question 10

A electric heater that draws 13.5 A of dc current has been left on for 10 min.How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)

Accepted Answer

A) 1.5 × 1022 
B) 5.1 × 1022 
C) 1.8 × 103 
D) 8.1 × 103 
E) 1.0 × 1023 
A) 1.5 × 1022 
B) 5.1 × 1022 
C) 1.8 × 103 
D) 8.1 × 103 
E) 1.0 × 1023

Question 11

If the current through a circuit of constant resistance is doubled,the power dissipated by that circuit will

Accepted Answer

A) quadruple in magnitude. 
B) double in magnitude. 
C) decrease to one-half of what it was. 
D) decrease to one-fourth of what it was. 
A) quadruple in magnitude. 
B) double in magnitude. 
C) decrease to one-half of what it was. 
D) decrease to one-fourth of what it was.

Question 12

Determine the current through the 18-Ω resistor for the circuit shown in the figure assuming that the batteries are ideal.

Accepted Answer

A) 0.25 A 
B) 0.50 A 
C) 0.75 A 
D) 1.0 A 
A) 0.25 A 
B) 0.50 A 
C) 0.75 A 
D) 1.0 A

Question 13

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

Question 14

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) charge 
A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) charge

Question 15

A 6.0-V battery that can store $500.0 \mathrm {~J}$ of energy is connected to a resistor.How much charge must flow between the battery's terminals to completely drain the battery if it is fully charged? Assume that the voltage of the battery remains the same until it is totally drained.

Accepted Answer

A) 83 C 
B) 0.010 C 
C) 3000 C 
D) 0.07 C 
A) 83 C 
B) 0.010 C 
C) 3000 C 
D) 0.07 C

Question 16

When there is a 14.0-A current through an 8.00-Ω device for 24.0 hours,how much does this cost if energy costs $0.0900 per kW ∙ h?

Accepted Answer

A) $0.24 
B) $1.04 
C) $2.16 
D) $3.39 
A) $0.24 
B) $1.04 
C) $2.16 
D) $3.39

Question 17

When an external resistor of resistance R1 = 14 Ω is connected across the terminals of a battery,there is a current of 6.0 A through the resistor.When a different external resistor of resistance R2 = 64.4 Ω is connected instead,the current is 2.0 A.Calculate (a)the emf of the battery and (b)the internal resistance of the battery.

Accepted Answer

Question 18

An ideal 10.0-V dc is connected across a $590.0 - \Omega ,$ resistor in series with an $840.0 - \Omega$ resistor.What is the potential drop across the $590.0 \Omega$ resistor?

Accepted Answer

A) 4.1 V 
B) 5.9 V 
C) 14 V 
D) 7.0 V 
A) 4.1 V 
B) 5.9 V 
C) 14 V 
D) 7.0 V

Question 19

If the resistance in a constant voltage circuit is doubled,the power dissipated by that circuit will

Accepted Answer

A) increase by a factor of two. 
B) increase by a factor of four. 
C) decrease to one-half its original value. 
D) decrease to one-fourth its original value. 
A) increase by a factor of two. 
B) increase by a factor of four. 
C) decrease to one-half its original value. 
D) decrease to one-fourth its original value.

Question 20

An instrument is rated at 250 W if it is connected across a 120-V dc power supply.
(a)What current does it draw under normal operation?
(b)What is its resistance?
(c)How many kilowatt-hours does it use in a day if it is left on all the time?

Accepted Answer

(a)2.1 A

Exam 17: Dc Circuits

What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.

Consider two copper wires of equal length.One wire has twice the cross-sectional area of the other.How do the resistances of these two wires compare?

For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

What potential difference is required to cause 4.00 A of current through a resistance of 330 Ω?

The figure shows conventional current through a resistor.The arrow shows the direction of this conventional current.Which of the following statements are correct? (There could be more than one correct choice.)

What is the magnitude of the potential difference between points A and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Consider two copper wires of equal cross-sectional area.One wire has 3 times the length of the other.How do the resistances of these two wires compare?

Two 100-W light bulbs of fixed resistance are to be connected to an ideal 120-V source.What are the current,potential difference,and dissipated power for each bulb when they are connected (a)in parallel (the normal arrangement)? (b)in series?

Each of the resistors shown in the figure has a resistance of 180.0Ω180.0 \Omega180.0Ω What is the equivalent resistance between points a and b of this combination?

A electric heater that draws 13.5 A of dc current has been left on for 10 min.How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)

If the current through a circuit of constant resistance is doubled,the power dissipated by that circuit will

Determine the current through the 18-Ω resistor for the circuit shown in the figure assuming that the batteries are ideal.

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

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

A 6.0-V battery that can store 500.0 J500.0 \mathrm {~J}500.0 J of energy is connected to a resistor.How much charge must flow between the battery's terminals to completely drain the battery if it is fully charged? Assume that the voltage of the battery remains the same until it is totally drained.

When there is a 14.0-A current through an 8.00-Ω device for 24.0 hours,how much does this cost if energy costs $0.0900 per kW ∙ h?

An ideal 10.0-V dc is connected across a 590.0−Ω,590.0 - \Omega ,590.0−Ω, resistor in series with an 840.0−Ω840.0 - \Omega840.0−Ω resistor.What is the potential drop across the 590.0Ω590.0 \Omega590.0Ω resistor?

If the resistance in a constant voltage circuit is doubled,the power dissipated by that circuit will

An instrument is rated at 250 W if it is connected across a 120-V dc power supply. (a)What current does it draw under normal operation? (b)What is its resistance? (c)How many kilowatt-hours does it use in a day if it is left on all the time?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

A electric heater that draws 13.5 A of dc current has been left on for 10 min.How many electrons that have passed through the heater during that time? (e = 1.60 × 10^-19C)

A 6.0-V battery that can store $500.0 \mathrm {~J}$ of energy is connected to a resistor.How much charge must flow between the battery's terminals to completely drain the battery if it is fully charged? Assume that the voltage of the battery remains the same until it is totally drained.

An ideal 10.0-V dc is connected across a $590.0 - \Omega ,$ resistor in series with an $840.0 - \Omega$ resistor.What is the potential drop across the $590.0 \Omega$ resistor?