Question 1

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 mA 
A) 45 mA 
B) 18 mA 
C) 4.4 mA 
D) 2.0 mA 
E) 320 mA

Question 2

Determine the current through the 4.0-Ω resistor for the circuit shown in the figure.Assume that the batteries are ideal and that all numbers are accurate to two significant figures.

Accepted Answer

A) 0.28 A 
B) 1.3 A 
C) 1.6 A 
D) 2.1 A 
A) 0.28 A 
B) 1.3 A 
C) 1.6 A 
D) 2.1 A

Question 3

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

Accepted Answer

A) 100 Ω 
B) 8.0 × 10-3 Ω 
C) 6.0 × 10-3 Ω 
D) 120 Ω 
E) 240 Ω 
A) 100 Ω 
B) 8.0 × 10-3 Ω 
C) 6.0 × 10-3 Ω 
D) 120 Ω 
E) 240 Ω

Question 4

If the current through R2  is 1.5 A ,what is the emf V of the ideal battery in the figure?

Accepted Answer

A) 150 V 
B) 75 V 
C) 60 V 
D) 30 V 
A) 150 V 
B) 75 V 
C) 60 V 
D) 30 V

Question 5

A battery is rated such that it provides $1.0 \mathrm {~mW}$ of power at $9.0 \mathrm {~V}$ when fully charged.How much current can it deliver?

Accepted Answer

A) 0.11 mA 
B) 81 kA 
C) 0.33 mA 
D) 9.1 kA 
A) 0.11 mA 
B) 81 kA 
C) 0.33 mA 
D) 9.1 kA

Question 6

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 7

Draw a circuit with a battery connected to four resistors,R1,R2,R3,and R4,as follows.Resistors R1 and R2 are connected in parallel with each other,resistors R3 and R4 are connected in parallel with each other,and both parallel sets of resistors are connected in series with each other across the battery.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 8

You obtain a 100-W light bulb and a 50-W light bulb.Instead of connecting them in the normal way,you devise a circuit that places them in series across normal household voltage.If each one is an incandescent bulb of fixed resistance,which statement about these bulbs is correct?

Accepted Answer

A) Both bulbs glow with the same brightness, but less than their normal brightness. 
B) Both bulbs glow with the same brightness, but more than their normal brightness. 
C) The 100-W bulb glows brighter than the 50-W bulb. 
D) The 50-W bulb glows more brightly than the 100-W bulb. 
A) Both bulbs glow with the same brightness, but less than their normal brightness. 
B) Both bulbs glow with the same brightness, but more than their normal brightness. 
C) The 100-W bulb glows brighter than the 50-W bulb. 
D) The 50-W bulb glows more brightly than the 100-W bulb.

Question 9

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?

Accepted Answer

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

Question 10

What is the current through a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

Accepted Answer

A) 2.2 A 
B) 0.67 A 
C) 0.30 A 
D) 0.20 A 
A) 2.2 A 
B) 0.67 A 
C) 0.30 A 
D) 0.20 A

Question 11

Four unequal resistors are connected in series with each other.Which one of the following statements is correct about this combination?

Accepted Answer

A) The equivalent resistance is equal to that of any one of the resistors. 
B) The equivalent resistance is equal to average of the four resistances. 
C) The equivalent resistance is less than that of the smallest resistor. 
D) The equivalent resistance is less than that of the largest resistor. 
E) The equivalent resistance is more than the largest resistance. 
A) The equivalent resistance is equal to that of any one of the resistors. 
B) The equivalent resistance is equal to average of the four resistances. 
C) The equivalent resistance is less than that of the smallest resistor. 
D) The equivalent resistance is less than that of the largest resistor. 
E) The equivalent resistance is more than the largest resistance.

Question 12

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

Question 13

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V = 2.0 V,as shown in the figure.What is the total current I through this circuit?

Accepted Answer

A) 0.70 A 
B) 1.5 A 
C) 2.0 A 
D) 3.0 A 
E) 6.0 A 
A) 0.70 A 
B) 1.5 A 
C) 2.0 A 
D) 3.0 A 
E) 6.0 A

Question 14

For the circuit shown in the figure,the ideal battery has an emf ε = 80 V.The four resistors have resistances of $R 1 = 14 \Omega$ $R _ { 2 } = 21 \Omega$ $R _ { 3 } = 21 \Omega$ and $R _ { 4 } = 14 \Omega$ Calculate the rate at which thermal energy is being generated in the resistor R4.

Accepted Answer

Question 15

A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference.
(a)What is the resistance of the wire?
(b)What is the resistivity of the material from which the wire is made?

Accepted Answer

(a)6.0 Ω

Question 16

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 × 1019 
A) 1.5 × 1019 
B) 2.5 × 1019 
C) 3.5 × 1019 
D) 4.5 × 1019

Question 17

A portion of a circuit is shown in the figure,and the batteries are ideal.What is the potential difference VA - VB if I = 5.0 A?

Accepted Answer

A) 63 V 
B) 35 V 
C) 55 V 
D) 45 V 
E) 71 V 
A) 63 V 
B) 35 V 
C) 55 V 
D) 45 V 
E) 71 V

Question 18

A multiloop circuit is shown in the figure.Find the current I2 if the batteries are ideal.(It is not necessary to solve the entire circuit.)

Accepted Answer

A) -3 A 
B) 3 A 
C) 7 A 
D) -7 A 
E) 0 A 
A) -3 A 
B) 3 A 
C) 7 A 
D) -7 A 
E) 0 A

Question 19

A 25-W soldering iron runs on 110 V dc.What is its resistance?

Accepted Answer

A) 0.0020 Ω 
B) 4.4 Ω 
C) 0.48 kΩ 
D) 2.8 kΩ 
A) 0.0020 Ω 
B) 4.4 Ω 
C) 0.48 kΩ 
D) 2.8 kΩ

Question 20

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. 
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.

Exam 17: Dc Circuits

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

Determine the current through the 4.0-Ω resistor for the circuit shown in the figure.Assume that the batteries are ideal and that all numbers are accurate to two significant figures.

A 100-W light bulb is operated by a 110-V dc source.What is the resistance of this bulb?

If the current through R2 is 1.5 A ,what is the emf V of the ideal battery in the figure?

A battery is rated such that it provides 1.0 mW1.0 \mathrm {~mW}1.0 mW of power at 9.0 V9.0 \mathrm {~V}9.0 V when fully charged.How much current can it deliver?

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?

You obtain a 100-W light bulb and a 50-W light bulb.Instead of connecting them in the normal way,you devise a circuit that places them in series across normal household voltage.If each one is an incandescent bulb of fixed resistance,which statement about these bulbs is correct?

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?

What is the current through a wire if 0.67 C of charge pass a point in the wire in 0.30 s?

Four unequal resistors are connected in series with each other.Which one of the following statements is correct about this combination?

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

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V = 2.0 V,as shown in the figure.What is the total current I through this circuit?

A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. (a)What is the resistance of the wire? (b)What is the resistivity of the material from which the wire is made?

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)

A portion of a circuit is shown in the figure,and the batteries are ideal.What is the potential difference VA - VB if I = 5.0 A?

A multiloop circuit is shown in the figure.Find the current I2 if the batteries are ideal.(It is not necessary to solve the entire circuit.)

A 25-W soldering iron runs on 110 V dc.What is its resistance?

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?

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

If the current through R₂ is 1.5 A ,what is the emf V of the ideal battery in the figure?

A battery is rated such that it provides $1.0 \mathrm {~mW}$ of power at $9.0 \mathrm {~V}$ when fully charged.How much current can it deliver?

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?

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)

A portion of a circuit is shown in the figure,and the batteries are ideal.What is the potential difference V_A- V_B if I = 5.0 A?

A multiloop circuit is shown in the figure.Find the current I₂if the batteries are ideal.(It is not necessary to solve the entire circuit.)