Question 1

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

Question 2

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

Question 3

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

Question 4

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.

Question 5

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.

Question 6

An electron and a proton

Accepted Answer

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

Question 7

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

Question 8

Electric potential energy is measured in units of

Accepted Answer

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

Question 9

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 10

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.

Question 11

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

Question 12

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

Question 13

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.

Question 14

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. D

Question 15

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

Question 16

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

Question 17

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

Question 18

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.

Question 19

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

Question 20

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 B

Exam 8: Static and Current Electricity

A flow of electrons move in an electric circuit by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An electron and a proton

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Electric potential energy is measured in units of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedAn insulator is any material composed of...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

An ampere is a unit of electric

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

Electric field lines about a point charge extend

Correct AnswerverifiedShow Answer

Which statement is correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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An insulator is any material composed of...
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