Question 1

Household circuits are wired in ________.

Accepted Answer

A)  series 
B)  parallel 
C)  both series and parallel 
D)  neither series nor parallel 
A)  series 
B)  parallel 
C)  both series and parallel 
D)  neither series nor parallel B

Question 2

Using a capacitor and two different value resistors,which of the following combinations in an RC circuit would give the greatest time constant?

Accepted Answer

A)  the capacitor in series with both resistors in series with each other 
B)  the capacitor in series with both resistors in parallel with each other 
C)  the capacitor in series with the higher value resistor 
D)  the capacitor in series with the lower value resistor 
A)  the capacitor in series with both resistors in series with each other 
B)  the capacitor in series with both resistors in parallel with each other 
C)  the capacitor in series with the higher value resistor 
D)  the capacitor in series with the lower value resistor A

Question 3

Kirchhoff's rules are the junction rule and the loop rule.Which of the following statements is true?

Accepted Answer

A)  Both rules are based on the conservation of charge. 
B)  Both rules are based on the conservation of energy. 
C)  The junction rule is based on the conservation of charge,and the loop rule is based on the conservation of energy. 
D)  The junction rule is based on the conservation of energy,and the loop rule is based on the conservation of charge. 
A)  Both rules are based on the conservation of charge. 
B)  Both rules are based on the conservation of energy. 
C)  The junction rule is based on the conservation of charge,and the loop rule is based on the conservation of energy. 
D)  The junction rule is based on the conservation of energy,and the loop rule is based on the conservation of charge. C

Question 4

The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning the behavior of the system is not changed when using the meter):

Accepted Answer

A)  zero and zero. 
B)  infinite and infinite. 
C)  zero and infinite. 
D)  infinite and zero. 
A)  zero and zero. 
B)  infinite and infinite. 
C)  zero and infinite. 
D)  infinite and zero.

Question 5

Consider the circuit shown in the figure.What power is dissipated by the entire circuit?

Accepted Answer

A)  14 W 
B)  28 W 
C)  52 W 
D)  112 W 
A)  14 W 
B)  28 W 
C)  52 W 
D)  112 W

Question 6

The two ends of a 2.3-Ω resistor are connected to a 9.9-V battery.What is the total power delivered by the battery to the circuit?

Accepted Answer

A)  1.9 W 
B)  42.6 W 
C)  4.3 W 
D)  52.4 W 
E)  ​225.4 W 
A)  1.9 W 
B)  42.6 W 
C)  4.3 W 
D)  52.4 W 
E)  ​225.4 W

Question 7

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,VA - VB?

Accepted Answer

A)  −40 V 
B)  +40 V 
C)  +20 V 
D)  -20 V 
A)  −40 V 
B)  +40 V 
C)  +20 V 
D)  -20 V

Question 8

Three resistors connected in series each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?

Accepted Answer

A)  IT = I1 + I2 + I3 
B)  IT = (1/I1 + 1/I2 + 1/I3) 
C)  IT = I1 = I2 = I3 
D)  IT = (1/I1 + 1/I2 + 1/I3)−1 
A)  IT = I1 + I2 + I3 
B)  IT = (1/I1 + 1/I2 + 1/I3) 
C)  IT = I1 = I2 = I3 
D)  IT = (1/I1 + 1/I2 + 1/I3)−1

Question 9

Four 7-Ω resistors are connected in series.What is their equivalent resistance?

Accepted Answer

A)  28 Ω 
B)  7 Ω 
C)  21 Ω 
D)  1.8 Ω 
E)  ​11 Ω 
A)  28 Ω 
B)  7 Ω 
C)  21 Ω 
D)  1.8 Ω 
E)  ​11 Ω

Question 10

Resistors of values 6.0Ω,4.0Ω,10.0Ω and 7.0Ω are combined as shown.What is the equivalent resistance for this combination?

Accepted Answer

A)  2.3 Ω 
B)  3.0 Ω 
C)  10.7 Ω 
D)  27 Ω 
A)  2.3 Ω 
B)  3.0 Ω 
C)  10.7 Ω 
D)  27 Ω

Question 11

Three resistors,each with resistance R1,are in series in a circuit.They are replaced by one equivalent resistor,R.Comparing this resistor to the first resistor of the initial circuit,which of the following is true?

Accepted Answer

A)  The current through R equals the current through R1. 
B)  The voltage across R equals the voltage across R1. 
C)  The power given off by R equals the power given off by R1. 
D)  R is less than R1. 
A)  The current through R equals the current through R1. 
B)  The voltage across R equals the voltage across R1. 
C)  The power given off by R equals the power given off by R1. 
D)  R is less than R1.

Question 12

If one doubles the emfs in a circuit and doubles the resistances in the circuit at the same time,what happens to the currents through the resistors? Assume there are only emfs and resistors in the circuit.

Accepted Answer

A)  They stay the same. 
B)  They double. 
C)  They quadruple. 
D)  They halve. 
A)  They stay the same. 
B)  They double. 
C)  They quadruple. 
D)  They halve.

Question 13

Three resistors connected in parallel have individual values of 4.0,6.0 and 10.0 Ω,respectively.If this combination is connected in series with a 12-V battery and a 2.0-Ω resistor,what is the current in the 10-Ω resistor?

Accepted Answer

A)  0.59 A 
B)  1.0 A 
C)  11 A 
D)  16 A 
A)  0.59 A 
B)  1.0 A 
C)  11 A 
D)  16 A

Question 14

Which voltage is not caused by a source of emf?

Accepted Answer

A)  the voltage across a charged capacitor 
B)  the voltage across two copper-iron junctions at different temperatures 
C)  the voltage across the terminals of a dry cell battery 
D)  the voltage from an electric generator 
A)  the voltage across a charged capacitor 
B)  the voltage across two copper-iron junctions at different temperatures 
C)  the voltage across the terminals of a dry cell battery 
D)  the voltage from an electric generator

Question 15

Three resistors connected in parallel have the individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the total voltage ΔVT across the three resistors when connected in this manner?

Accepted Answer

A)  ΔVT = ΔV1 + ΔV2 + ΔV3 
B)  ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C)  ΔVT = ΔV1 = ΔV2 = ΔV3 
D)  ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1 
A)  ΔVT = ΔV1 + ΔV2 + ΔV3 
B)  ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C)  ΔVT = ΔV1 = ΔV2 = ΔV3 
D)  ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1

Question 16

If R1 2 3,and if these resistors are connected in series in a circuit,which one dissipates the greatest power?

Accepted Answer

A)  R1 
B)  R2 
C)  R3 
D)  All are equal in power dissipation. 
A)  R1 
B)  R2 
C)  R3 
D)  All are equal in power dissipation.

Question 17

If ε = 24 V,at what rate is thermal energy generated in the 20-Ω resistor?

Accepted Answer

A)  13 W 
B)  3.2 W 
C)  23 W 
D)  39 W 
A)  13 W 
B)  3.2 W 
C)  23 W 
D)  39 W

Question 18

What is the equivalent resistance for these 3.00-Ω resistors?

Accepted Answer

A)  1.33 Ω 
B)  2.25 Ω 
C)  3.00 Ω 
D)  7.50 Ω 
A)  1.33 Ω 
B)  2.25 Ω 
C)  3.00 Ω 
D)  7.50 Ω

Question 19

In an RC circuit using two capacitors in series with two resistors,which of the following combinations would give the greatest time constant?

Accepted Answer

A)  both capacitors in series placed in series with both resistors in series 
B)  both capacitors in parallel placed in series with both resistors in parallel 
C)  both capacitors in series placed in series with both resistors in parallel 
D)  both capacitors in parallel placed in series with both resistors in series 
A)  both capacitors in series placed in series with both resistors in series 
B)  both capacitors in parallel placed in series with both resistors in parallel 
C)  both capacitors in series placed in series with both resistors in parallel 
D)  both capacitors in parallel placed in series with both resistors in series

Question 20

Three 5-Ω resistors are connected in parallel.What is their equivalent resistance?

Accepted Answer

A)  0.12 Ω 
B)  2.5 Ω 
C)  0.6 Ω 
D)  1.7 Ω 
E)  ​5 Ω 
A)  0.12 Ω 
B)  2.5 Ω 
C)  0.6 Ω 
D)  1.7 Ω 
E)  ​5 Ω

Exam 18: Direct-Current Circuits Sources of EMF

Household circuits are wired in ________.

Using a capacitor and two different value resistors,which of the following combinations in an RC circuit would give the greatest time constant?

Kirchhoff's rules are the junction rule and the loop rule.Which of the following statements is true?

The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning the behavior of the system is not changed when using the meter):

Consider the circuit shown in the figure.What power is dissipated by the entire circuit?

The two ends of a 2.3-Ω resistor are connected to a 9.9-V battery.What is the total power delivered by the battery to the circuit?

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,VA - VB?

Three resistors connected in series each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?

Four 7-Ω resistors are connected in series.What is their equivalent resistance?

Resistors of values 6.0Ω,4.0Ω,10.0Ω and 7.0Ω are combined as shown.What is the equivalent resistance for this combination?

Three resistors,each with resistance R1,are in series in a circuit.They are replaced by one equivalent resistor,R.Comparing this resistor to the first resistor of the initial circuit,which of the following is true?

If one doubles the emfs in a circuit and doubles the resistances in the circuit at the same time,what happens to the currents through the resistors? Assume there are only emfs and resistors in the circuit.

Three resistors connected in parallel have individual values of 4.0,6.0 and 10.0 Ω,respectively.If this combination is connected in series with a 12-V battery and a 2.0-Ω resistor,what is the current in the 10-Ω resistor?

Which voltage is not caused by a source of emf?

Three resistors connected in parallel have the individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the total voltage ΔVT across the three resistors when connected in this manner?

If R1 < R2 < R3,and if these resistors are connected in series in a circuit,which one dissipates the greatest power?

If ε = 24 V,at what rate is thermal energy generated in the 20-Ω resistor?

What is the equivalent resistance for these 3.00-Ω resistors?

In an RC circuit using two capacitors in series with two resistors,which of the following combinations would give the greatest time constant?

Three 5-Ω resistors are connected in parallel.What is their equivalent resistance?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,V_A - V_B?

Three resistors connected in series each carry currents labeled I₁,I₂ and I₃.Which of the following expresses the value of the total current I_T in the system made up of the three resistors in series?

Three resistors,each with resistance R₁,are in series in a circuit.They are replaced by one equivalent resistor,R.Comparing this resistor to the first resistor of the initial circuit,which of the following is true?

Three resistors connected in parallel have the individual voltages labeled ΔV₁,ΔV₂ and ΔV₃,respectively.Which of the following expresses the total voltage ΔV_T across the three resistors when connected in this manner?

If R₁ < R₂ < R₃,and if these resistors are connected in series in a circuit,which one dissipates the greatest power?