Question 1

When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is

Accepted Answer

A) the speed of sound waves in metal. 
B) the speed of light. 
C) 1000 cm/s. 
D) less than 1 cm/s. 
E) dependent on how quickly each electron bumps into the next electron. 
A) the speed of sound waves in metal. 
B) the speed of light. 
C) 1000 cm/s. 
D) less than 1 cm/s. 
E) dependent on how quickly each electron bumps into the next electron. D

Question 2

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel. The current is greater in the lamp with the

Accepted Answer

A) thick filament. 
B) thin filament. 
C) same in each 
A) thick filament. 
B) thin filament. 
C) same in each A

Question 3

When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons

Accepted Answer

A) must be supplied by you, just as water in a water pipe. 
B) already exist in the wire. 
C) may fall out, which is why wires are insulated. 
D) none of the above 
A) must be supplied by you, just as water in a water pipe. 
B) already exist in the wire. 
C) may fall out, which is why wires are insulated. 
D) none of the above B

Question 4

The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is

Accepted Answer

A) 22 ohms. 
B) 44 ohms. 
C) 220 ohms. 
D) 440 ohms. 
E) none of the above 
A) 22 ohms. 
B) 44 ohms. 
C) 220 ohms. 
D) 440 ohms. 
E) none of the above

Question 5

The power dissipated in a 4-ohm resistor carrying 3 A is

Accepted Answer

A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) not enough information 
A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) not enough information

Question 6

What is the difference between an insulator and a conductor of electricity? Give examples of each.

Accepted Answer

An insulator is any material composed of

Question 7

A bird can sit harmlessly on a high-voltage wire because

Accepted Answer

A) the wire is insulated. 
B) no potential difference is across the birds feet. 
C) current is inside the wire. 
D) the net charge on a current-carrying wire is zero. 
E) all of these. 
A) the wire is insulated. 
B) no potential difference is across the birds feet. 
C) current is inside the wire. 
D) the net charge on a current-carrying wire is zero. 
E) all of these.

Question 8

Lillian touches a 100,000-V Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small

Accepted Answer

A) amount of energy. 
B) electric field. 
C) polarization. 
D) conduction. 
A) amount of energy. 
B) electric field. 
C) polarization. 
D) conduction.

Question 9

A difference between an insulator and a conductor is that a conductor has more

Accepted Answer

A) electrons than protons. 
B) protons than electrons. 
C) energy than an insulator. 
D) faster moving molecules. 
E) none of the above 
A) electrons than protons. 
B) protons than electrons. 
C) energy than an insulator. 
D) faster moving molecules. 
E) none of the above

Question 10

Which statement is correct?

Accepted Answer

A) charge flows through a circuit 
B) voltage flows through a circuit 
C) resistance is established across a circuit 
D) current causes voltage 
A) charge flows through a circuit 
B) voltage flows through a circuit 
C) resistance is established across a circuit 
D) current causes voltage

Question 11

A flow of electrons move in an electric circuit by

Accepted Answer

A) bumping other electrons. 
B) colliding with molecules. 
C) interacting with an established electric field. 
D) none of the above 
A) bumping other electrons. 
B) colliding with molecules. 
C) interacting with an established electric field. 
D) none of the above

Question 12

When a steady voltage is across one-half as much resistance, the current

Accepted Answer

A) is half. 
B) remains the same. 
C) is doubled. 
D) is quadrupled. 
A) is half. 
B) remains the same. 
C) is doubled. 
D) is quadrupled.

Question 13

Electric potential energy is measured in units of

Accepted Answer

A) volts. 
B) joules. 
C) amperes. 
D) watts. 
E) any or all of these 
A) volts. 
B) joules. 
C) amperes. 
D) watts. 
E) any or all of these

Question 14

Electric field lines about a point charge extend

Accepted Answer

A) outward when the charge is negative. 
B) outward when the charge is positive. 
C) in circles. 
A) outward when the charge is negative. 
B) outward when the charge is positive. 
C) in circles.

Question 15

An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric potential of both electrons is

Accepted Answer

A) 0.25 V. 
B) 0.5 V. 
C) 1 V. 
D) 2 V. 
E) 4 V. 
A) 0.25 V. 
B) 0.5 V. 
C) 1 V. 
D) 2 V. 
E) 4 V.

Question 16

An electron and a proton

Accepted Answer

A) attract each other. 
B) repel each other. 
C) attract or repel depending on distance. 
A) attract each other. 
B) repel each other. 
C) attract or repel depending on distance.

Question 17

An ampere is a unit of electric

Accepted Answer

A) pressure. 
B) current. 
C) resistance. 
D) all of the above 
E) none of the above 
A) pressure. 
B) current. 
C) resistance. 
D) all of the above 
E) none of the above

Question 18

Charge carriers in a metal are electrons rather than protons because electrons are

Accepted Answer

A) negative. 
B) smaller. 
C) loosely bound. 
D) all of the above 
E) none of the above 
A) negative. 
B) smaller. 
C) loosely bound. 
D) all of the above 
E) none of the above

Question 19

The current through a 10-ohm resistor connected to a 120-V power supply is

Accepted Answer

A) 1 A. 
B) 10 A. 
C) 12 A. 
D) 120 A. 
E) none of the above 
A) 1 A. 
B) 10 A. 
C) 12 A. 
D) 120 A. 
E) none of the above

Question 20

A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of operating the heater for 10 hours is

Accepted Answer

A) $0.22. 
B) $0.55. 
C) $2.20. 
D) $5.50. 
E) none of the above 
A) $0.22. 
B) $0.55. 
C) $2.20. 
D) $5.50. 
E) none of the above

Exam 8: Static and Current Electricity

When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel. The current is greater in the lamp with the

When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons

The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is

The power dissipated in a 4-ohm resistor carrying 3 A is

What is the difference between an insulator and a conductor of electricity? Give examples of each.

A bird can sit harmlessly on a high-voltage wire because

Lillian touches a 100,000-V Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small

A difference between an insulator and a conductor is that a conductor has more

Which statement is correct?

A flow of electrons move in an electric circuit by

When a steady voltage is across one-half as much resistance, the current

Electric potential energy is measured in units of

Electric field lines about a point charge extend

An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric potential of both electrons is

An electron and a proton

An ampere is a unit of electric

Charge carriers in a metal are electrons rather than protons because electrons are

The current through a 10-ohm resistor connected to a 120-V power supply is

A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of operating the heater for 10 hours is

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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