Question 1

Electrons flow in a wire when there is

Accepted Answer

A) an imbalance of charges in the wire. 
B) more potential energy at one end of the wire than the other end. 
C) a potential difference across its ends. 
A) an imbalance of charges in the wire. 
B) more potential energy at one end of the wire than the other end. 
C) a potential difference across its ends.

Question 2

What is electric resistance? What characteristics of a wire determine its resistance? How does resistance normally vary with temperature?

Accepted Answer

Electric resistance is the opposition a

Question 3

The unit of electric charge, the coulomb, is the charge on

Accepted Answer

A) one electron. 
B) one proton. 
C) a specific large number of electrons. 
A) one electron. 
B) one proton. 
C) a specific large number of electrons.

Question 4

What is the power rating of a device that draws 0.8 A when connected to 120 V?

Accepted Answer

A) 12 W 
B) 15 W 
C) 60 W 
D) 96 W 
E) 120 W 
A) 12 W 
B) 15 W 
C) 60 W 
D) 96 W 
E) 120 W

Question 5

A positive ion has a deficiency of

Accepted Answer

A) electrons. 
B) neutrons. 
C) negative ions. 
A) electrons. 
B) neutrons. 
C) negative ions.

Question 6

Electrical resistance is greater for

Accepted Answer

A) dry skin. 
B) wet skin. 
C) both the same 
A) dry skin. 
B) wet skin. 
C) both the same

Question 7

A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated in the line is

Accepted Answer

A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above 
A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above

Question 8

Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The voltage is greater across the lamp with the

Accepted Answer

A) thick filament. 
B) thin filament. 
C) same for both 
A) thick filament. 
B) thin filament. 
C) same for both

Question 9

A sustained flow of electric charge requires

Accepted Answer

A) a potential difference. 
B) a resistance. 
C) an electric field. 
D) electric polarization. 
A) a potential difference. 
B) a resistance. 
C) an electric field. 
D) electric polarization.

Question 10

An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can accommodate 15 A of current. How many heaters can be safely operated in the circuit?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5 
A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5

Question 11

A pair of 60-W and 100-W incandescent lamps are intended for 120-V operation. Which lamp draws more current?

Accepted Answer

A) 60-W lamp 
B) 100-W lamp 
C) both the same 
A) 60-W lamp 
B) 100-W lamp 
C) both the same

Question 12

A term for electric pressure is

Accepted Answer

A) current. 
B) voltage. 
C) electric resistance. 
A) current. 
B) voltage. 
C) electric resistance.

Question 13

To say a circuit is dc is to say that current in the circuit

Accepted Answer

A) has a single direction. 
B) alternates only slowly. 
C) is parallel to the connecting wires. 
A) has a single direction. 
B) alternates only slowly. 
C) is parallel to the connecting wires.

Question 14

More toll booths on a highway is analogous to a

Accepted Answer

A) series circuit. 
B) parallel circuit. 
C) complex series/parallel circuit. 
A) series circuit. 
B) parallel circuit. 
C) complex series/parallel circuit.

Question 15

Two lamps, one with a thick filament and one with a thin filament, are connected in series. 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

Question 16

A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is

Accepted Answer

A) less. 
B) greater. 
C) the same. 
A) less. 
B) greater. 
C) the same.

Question 17

Electric potential 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 18

If you plug an electric toaster rated at 110-V into a 220-V outlet, current in the toaster will be about

Accepted Answer

A) half what is should be. 
B) the same as if it were plugged into 110-V. 
C) more than twice what it should be. 
D) twice what it should be. 
A) half what is should be. 
B) the same as if it were plugged into 110-V. 
C) more than twice what it should be. 
D) twice what it should be.

Question 19

The source of electrons in an ordinary electric circuit is

Accepted Answer

A) a dry cell, wet cell, or battery. 
B) usually a wall socket. 
C) a generator at the power station. 
D) the electric conductor itself. 
E) none of the above 
A) a dry cell, wet cell, or battery. 
B) usually a wall socket. 
C) a generator at the power station. 
D) the electric conductor itself. 
E) none of the above

Question 20

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

Accepted Answer

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

Exam 8: Static and Current Electricity

Electrons flow in a wire when there is

What is electric resistance? What characteristics of a wire determine its resistance? How does resistance normally vary with temperature?

The unit of electric charge, the coulomb, is the charge on

What is the power rating of a device that draws 0.8 A when connected to 120 V?

A positive ion has a deficiency of

Electrical resistance is greater for

A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated in the line is

Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The voltage is greater across the lamp with the

A sustained flow of electric charge requires

An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can accommodate 15 A of current. How many heaters can be safely operated in the circuit?

A pair of 60-W and 100-W incandescent lamps are intended for 120-V operation. Which lamp draws more current?

A term for electric pressure is

To say a circuit is dc is to say that current in the circuit

More toll booths on a highway is analogous to a

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

A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is

Electric potential is measured in units of

If you plug an electric toaster rated at 110-V into a 220-V outlet, current in the toaster will be about

The source of electrons in an ordinary electric circuit is

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

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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