Question 1

A number of resistors are connected across points A and B as shown in the figure.What is the equivalent resistance between points A and B?

Accepted Answer

A) 4 Ω 
B) 6 Ω 
C) 8 Ω 
D) 10 Ω 
E) 12 Ω 
A) 4 Ω 
B) 6 Ω 
C) 8 Ω 
D) 10 Ω 
E) 12 Ω

Question 2

For the circuit shown in the figure,R1 = 18 Ω,R2 = 44 Ω,R3 = 33 Ω,R4 = 14 Ω,R5 = 12 Ω,V1 = 18 V,V2 = 12 V,and the batteries are ideal.Determine I1 and I2.

Accepted Answer

I₁ = 0.25 A

Question 3

A battery supplies 6.0 mA to a 12-Ω resistor for 1.5 h.How much electric energy does this resistor dissipate in this time?

Accepted Answer

The answer of A battery supplies 6.0 mA to a...

Question 4

A battery has an emf ε = 78.0 V and an internal resistance r = 4.0 Ω,as shown in the figure.A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b.The power dissipated by the resistor R is closest to

Accepted Answer

A) 280 W. 
B) 340 W. 
C) 320 W. 
D) 300 W. 
E) 370 W. 
A) 280 W. 
B) 340 W. 
C) 320 W. 
D) 300 W. 
E) 370 W.

Question 5

The resistors in the circuit shown in the figure each have a resistance of $700 \Omega$ What is the equivalent resistance between points a and b of this combination?

Accepted Answer

A) 700 Ω 
B) 2800 Ω 
C) 175 Ω 
D) 1400 Ω 
A) 700 Ω 
B) 2800 Ω 
C) 175 Ω 
D) 1400 Ω

Question 6

The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2.What is the new resistance of this wire?

Accepted Answer

A) It is 2 times as large. 
B) It is 4 times as large. 
C) It is 6 times as large. 
D) It it 8 times as large. 
E) It is ½ as large. 
A) It is 2 times as large. 
B) It is 4 times as large. 
C) It is 6 times as large. 
D) It it 8 times as large. 
E) It is ½ as large.

Question 7

A 150-W light bulb is designed to operate at 110 V dc.How much current does it draw?

Accepted Answer

A) 0.73 A 
B) 1.4 A 
C) 2.0 A 
D) 15 A 
A) 0.73 A 
B) 1.4 A 
C) 2.0 A 
D) 15 A

Question 8

There is a 10-A current through a wire for 2.0 min.(e = 1.60 × 10-19 C)
(a)How much charge has passed through this wire?
(b)How many electrons have passed any point in the wire?

Accepted Answer

(a)1200 C

Question 9

An ideal 100-V dc battery is applied across a series combination of four resistors having resistances of 20 Ω,40 Ω,60 Ω,and 80 Ω.What is the potential difference across the 40-Ω resistor?

Accepted Answer

A) 20 V 
B) 40 V 
C) 60 V 
D) 80 V 
E) 100 V 
A) 20 V 
B) 40 V 
C) 60 V 
D) 80 V 
E) 100 V

Question 10

Two resistors having resistances of 5.0 Ω and 9.0 Ω are connected in parallel.A 4.0-Ω resistor is then connected in series with the parallel combination.An ideal 6.0-V battery is then connected across the series-parallel combination.What is the current through the 9.0-Ω resistor?

Accepted Answer

A) 0.35 A 
B) 0.53 A 
C) 0.83 A 
D) 0.30 A 
E) 0.67 A 
A) 0.35 A 
B) 0.53 A 
C) 0.83 A 
D) 0.30 A 
E) 0.67 A

Question 11

How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?

Accepted Answer

A) $1.50 
B) 25¢ 
C) 16¢ 
D) 1.6¢ 
A) $1.50 
B) 25¢ 
C) 16¢ 
D) 1.6¢

Question 12

If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current through the wire? (e = 1.60 × 10-19 C)

Accepted Answer

A) 0.12 mA 
B) 0.24 mA 
C) 7.5 × 107 A 
D) 7.5 × 1014 A 
A) 0.12 mA 
B) 0.24 mA 
C) 7.5 × 107 A 
D) 7.5 × 1014 A

Question 13

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 ∙ s 
A) 1 V/A 
B) 1 Ω ∙ m 
C) 1 V ∙ A 
D) 1 V/Ω 
E) 1 A ∙ s

Question 14

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

Accepted Answer

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

Question 15

When a 1.0-m length of metal wire is connected to a $1.5 - V$ battery,there is a current of $8.0 \mathrm {~mA}$ through it.What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 Ω ∙ m.

Accepted Answer

A) 12 μm 
B) 6.0 μm 
C) 24 μm 
D) 2.2 μm 
A) 12 μm 
B) 6.0 μm 
C) 24 μm 
D) 2.2 μm

Question 16

When there is a 5.00 A current through an 10.0-Ω device,how much power is being dissipated in the device?

Accepted Answer

A) 50.0 W 
B) 250 W 
C) 500 W 
D) 2.50 kW 
A) 50.0 W 
B) 250 W 
C) 500 W 
D) 2.50 kW

Question 17

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

Accepted Answer

A) 1 J/s 
B) 1 W/A 
C) 1 V ∙ A 
D) 1 V/A 
E) 1 A ∙ s 
A) 1 J/s 
B) 1 W/A 
C) 1 V ∙ A 
D) 1 V/A 
E) 1 A ∙ s

Question 18

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 $\sqrt { 3 }$ times the resistance of the thinner wire. 
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 $\sqrt { 3 }$ times the resistance of the thinner wire.

Question 19

When unequal resistors are connected in parallel in a circuit,

Accepted Answer

A) there is always the same current through each resistor. 
B) the potential drop is always the same across each resistor. 
C) the largest resistance has the largest current through it. 
D) the power generated in each resistor is the same. 
A) there is always the same current through each resistor. 
B) the potential drop is always the same across each resistor. 
C) the largest resistance has the largest current through it. 
D) the power generated in each resistor is the same.

Question 20

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

Accepted Answer

A) 112 Ω 
B) 11.2 Ω 
C) 1.12 Ω 
D) 0.112 Ω 
E) 0.0112 Ω 
A) 112 Ω 
B) 11.2 Ω 
C) 1.12 Ω 
D) 0.112 Ω 
E) 0.0112 Ω

Exam 17: Dc Circuits

A number of resistors are connected across points A and B as shown in the figure.What is the equivalent resistance between points A and B?

For the circuit shown in the figure,R1 = 18 Ω,R2 = 44 Ω,R3 = 33 Ω,R4 = 14 Ω,R5 = 12 Ω,V1 = 18 V,V2 = 12 V,and the batteries are ideal.Determine I1 and I2.

A battery supplies 6.0 mA to a 12-Ω resistor for 1.5 h.How much electric energy does this resistor dissipate in this time?

A battery has an emf ε = 78.0 V and an internal resistance r = 4.0 Ω,as shown in the figure.A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b.The power dissipated by the resistor R is closest to

The resistors in the circuit shown in the figure each have a resistance of 700Ω700 \Omega700Ω What is the equivalent resistance between points a and b of this combination?

The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2.What is the new resistance of this wire?

A 150-W light bulb is designed to operate at 110 V dc.How much current does it draw?

There is a 10-A current through a wire for 2.0 min.(e = 1.60 × 10-19 C) (a)How much charge has passed through this wire? (b)How many electrons have passed any point in the wire?

An ideal 100-V dc battery is applied across a series combination of four resistors having resistances of 20 Ω,40 Ω,60 Ω,and 80 Ω.What is the potential difference across the 40-Ω resistor?

Two resistors having resistances of 5.0 Ω and 9.0 Ω are connected in parallel.A 4.0-Ω resistor is then connected in series with the parallel combination.An ideal 6.0-V battery is then connected across the series-parallel combination.What is the current through the 9.0-Ω resistor?

How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?

If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current through the wire? (e = 1.60 × 10-19 C)

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

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

When a 1.0-m length of metal wire is connected to a 1.5−V1.5 - V1.5−V battery,there is a current of 8.0 mA8.0 \mathrm {~mA}8.0 mA through it.What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 Ω ∙ m.

When there is a 5.00 A current through an 10.0-Ω device,how much power is being dissipated in the device?

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

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?

When unequal resistors are connected in parallel in a circuit,

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

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

For the circuit shown in the figure,R₁ = 18 Ω,R₂ = 44 Ω,R₃ = 33 Ω,R₄ = 14 Ω,R₅ = 12 Ω,V₁= 18V,V₂ = 12 V,and the batteries are ideal.Determine I₁ and I₂.

There is a 10-A current through a wire for 2.0 min.(e = 1.60 × 10^-19C) (a)How much charge has passed through this wire? (b)How many electrons have passed any point in the wire?

If 3.0 × 10¹⁵ electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current through the wire? (e = 1.60 × 10^-19C)

When a 1.0-m length of metal wire is connected to a $1.5 - V$ battery,there is a current of $8.0 \mathrm {~mA}$ through it.What is the diameter of the wire? The resistivity of the metal is 2.24 × 10^-8 Ω ∙ m.

The resistivity of the material of a wire is 1.76 × 10^-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?