Question 1

A 100-Watt lamp glows brighter than a 25-Watt lamp.The electrical resistance of the 100-Watt lamp must be

Accepted Answer

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

Question 2

There are electrons in the filament of the ac lamp in your bedroom.When you turn on the lamp and it glows,the glowing comes from

Accepted Answer

A) different electrons;the ones that flow in the circuit to your lamp. 
B) the same electrons. 
C) the positive charges that flow in the filament. 
A) different electrons;the ones that flow in the circuit to your lamp. 
B) the same electrons. 
C) the positive charges that flow in the filament. B

Question 3

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

Accepted Answer

A) half what it 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 it 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. D

Question 4

The electric power of a lamp that carries 2 A at 120 V is

Accepted Answer

A) 1/6 watts. 
B) 2 watts. 
C) 60 watts. 
D) 20 watts. 
E) 240 watts. 
A) 1/6 watts. 
B) 2 watts. 
C) 60 watts. 
D) 20 watts. 
E) 240 watts.

Question 5

Compared to the filament thickness of a 60-W light bulb,the filament of a 100-W light bulb will be

Accepted Answer

A) thinner. 
B) thicker. 
C) the same. 
A) thinner. 
B) thicker. 
C) the same.

Question 6

In a 110-volt circuit containing a lamp in series with the voltage source

Accepted Answer

A) 110 coulombs of charge flow through the lamp every second. 
B) 110 joules of energy are converted to heat and light in the circuit every second. 
C) 110 joules of energy are given up by each coulomb of charge making up the current in the circuit. 
D) 110 joules of energy are shared among all the coulombs in the circuit at any instant. 
E) none of the above 
A) 110 coulombs of charge flow through the lamp every second. 
B) 110 joules of energy are converted to heat and light in the circuit every second. 
C) 110 joules of energy are given up by each coulomb of charge making up the current in the circuit. 
D) 110 joules of energy are shared among all the coulombs in the circuit at any instant. 
E) none of the above

Question 7

Compared to a single lamp connected to a battery,two identical lamps connected in series to the same battery will carry

Accepted Answer

A) more current. 
B) less current. 
C) the same current. 
A) more current. 
B) less current. 
C) the same current.

Question 8

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.

Question 9

Two lamps,one with a thick filament and one with a thin filament of the same material,are connected in parallel to a battery.The current is

Accepted Answer

A) larger in the lamp with the thick filament. 
B) larger in the lamp with the thin filament. 
C) the same in both lamps. 
A) larger in the lamp with the thick filament. 
B) larger in the lamp with the thin filament. 
C) the same in both lamps.

Question 10

When two lamps are connected in series to a battery,the electrical resistance that the battery senses is

Accepted Answer

A) more than the resistance of either lamp. 
B) less than the resistance of either lamp. 
C) none of these 
A) more than the resistance of either lamp. 
B) less than the resistance of either lamp. 
C) none of these

Question 11

A 60-W light bulb and a 100-W light bulb are each rated at 120 V.Which light bulb has a larger resistance?

Accepted Answer

A) the 60-W bulb 
B) the 100-W bulb 
C) Both have the same resistance. 
A) the 60-W bulb 
B) the 100-W bulb 
C) Both have the same resistance.

Question 12

A 10-ohm resistor has a 5-A current in it.What is the voltage across the resistor?

Accepted Answer

A) 5 V 
B) 10 V 
C) 15 V 
D) 20 V 
E) more than 20 V 
A) 5 V 
B) 10 V 
C) 15 V 
D) 20 V 
E) more than 20 V

Question 13

The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was

Accepted Answer

A) zero. 
B) 110. 
C) 220. 
D) billions of billions. 
E) none of these 
A) zero. 
B) 110. 
C) 220. 
D) billions of billions. 
E) none of these

Question 14

An electrical diode is useful for

Accepted Answer

A) storing electrical energy. 
B) boosting voltage. 
C) limiting current. 
D) voltage modification. 
E) changing ac to dc. 
A) storing electrical energy. 
B) boosting voltage. 
C) limiting current. 
D) voltage modification. 
E) changing ac to dc.

Question 15

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

Accepted Answer

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

Question 16

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as

Accepted Answer

A) potential drop. 
B) conductivity. 
C) resistance. 
D) electromagnetic force. 
E) None of the above choices are correct. 
A) potential drop. 
B) conductivity. 
C) resistance. 
D) electromagnetic force. 
E) None of the above choices are correct.

Question 17

Three resistors,1-ohm,2-ohm,and 3- ohm are connected in parallel.If they were connected in series instead their equivalent resistance would be

Accepted Answer

A) 7 times as great. 
B) 9 times as great. 
C) 11 times as great. 
D) 13 times as great. 
E) None of the above choices are correct. 
A) 7 times as great. 
B) 9 times as great. 
C) 11 times as great. 
D) 13 times as great. 
E) None of the above choices are correct.

Question 18

Electrons move in an electrical circuit

Accepted Answer

A) by being bumped by other electrons. 
B) by colliding with molecules. 
C) by interacting with an established electric field. 
D) because the wires are so thin. 
E) none of these 
A) by being bumped by other electrons. 
B) by colliding with molecules. 
C) by interacting with an established electric field. 
D) because the wires are so thin. 
E) none of these

Question 19

When two 1-ohm resistors are connected in series,their combined resistance is

Accepted Answer

A) 1 ohm,and when connected in parallel,2 ohms. 
B) 2 ohms,and when in parallel,1 ohm. 
C) 1/2 ohm,and when in parallel,2 ohms. 
D) 2 ohms,and when in parallel,1/2 ohm. 
E) none of these 
A) 1 ohm,and when connected in parallel,2 ohms. 
B) 2 ohms,and when in parallel,1 ohm. 
C) 1/2 ohm,and when in parallel,2 ohms. 
D) 2 ohms,and when in parallel,1/2 ohm. 
E) none of these

Question 20

If 0.8 A of current flow through a light bulb connected to a 120 V outlet,the power consumed is

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.

Exam 23: Electric Current

A 100-Watt lamp glows brighter than a 25-Watt lamp.The electrical resistance of the 100-Watt lamp must be

There are electrons in the filament of the ac lamp in your bedroom.When you turn on the lamp and it glows,the glowing comes from

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

The electric power of a lamp that carries 2 A at 120 V is

Compared to the filament thickness of a 60-W light bulb,the filament of a 100-W light bulb will be

In a 110-volt circuit containing a lamp in series with the voltage source

Compared to a single lamp connected to a battery,two identical lamps connected in series to the same battery will carry

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 of the same material,are connected in parallel to a battery.The current is

When two lamps are connected in series to a battery,the electrical resistance that the battery senses is

A 60-W light bulb and a 100-W light bulb are each rated at 120 V.Which light bulb has a larger resistance?

A 10-ohm resistor has a 5-A current in it.What is the voltage across the resistor?

The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was

An electrical diode is useful for

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

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as

Three resistors,1-ohm,2-ohm,and 3- ohm are connected in parallel.If they were connected in series instead their equivalent resistance would be

Electrons move in an electrical circuit

When two 1-ohm resistors are connected in series,their combined resistance is

If 0.8 A of current flow through a light bulb connected to a 120 V outlet,the power consumed is

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