Question 1

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

Accepted Answer

A) greater in the lamp with the thick filament. 
B) greater in the lamp with the thin filament. 
C) the same in each lamp. 
A) greater in the lamp with the thick filament. 
B) greater in the lamp with the thin filament. 
C) the same in each lamp.

Question 2

A power line with a resistance of 2 ohms has a current of 80 A in it.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 these 
A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of these

Question 3

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

Accepted Answer

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

Question 4

When two lamps are connected in parallel 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 5

Modern automobile headlights are connected in

Accepted Answer

A) parallel. 
B) perpendicular. 
C) series. 
D) none of these 
A) parallel. 
B) perpendicular. 
C) series. 
D) none of these

Question 6

As more lamps are put into a parallel circuit,the overall current in the power source

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 7

When a 60-watt light bulb is connected to a 120-volt source the current in the light bulb is

Accepted Answer

A) 0)25 A. 
B) 0)5 A. 
C) 2 A. 
D) 4 A. 
E) more than 4 A. 
A) 0)25 A. 
B) 0)5 A. 
C) 2 A. 
D) 4 A. 
E) more than 4 A.

Question 8

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

Question 9

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

Question 10

On some early automobiles both headlights went out when one bulb burned out.The headlights must have been connected in

Accepted Answer

A) parallel. 
B) perpendicular. 
C) series. 
D) haste. 
A) parallel. 
B) perpendicular. 
C) series. 
D) haste.

Question 11

The headlights,radio,and defroster fan in an automobile are connected in

Accepted Answer

A) series with a switch for each. 
B) parallel with a switch for each. 
C) series without separate switches. 
D) parallel without separate switches. 
A) series with a switch for each. 
B) parallel with a switch for each. 
C) series without separate switches. 
D) parallel without separate switches.

Question 12

As more lamps are put into a series circuit,the overall current in the power source

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 13

The source of electrons lighting an incandescent ac light bulb is

Accepted Answer

A) the power company. 
B) electrical outlet. 
C) atoms in the light bulb filament. 
D) the wire leading to the lamp. 
E) the source voltage. 
A) the power company. 
B) electrical outlet. 
C) atoms in the light bulb filament. 
D) the wire leading to the lamp. 
E) the source voltage.

Question 14

What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?

Accepted Answer

A) 1 ohm 
B) 60 ohms 
C) 100 ohms 
D) 144 ohms 
E) none of these 
A) 1 ohm 
B) 60 ohms 
C) 100 ohms 
D) 144 ohms 
E) none of these

Question 15

What condition must exist between two points in a conductor in order to maintain a flow of charge?

Accepted Answer

A) a steady magnetic field 
B) a high resistance 
C) a switch connected in series 
D) All of the above choices are correct. 
E) None of the above choices are correct. 
A) a steady magnetic field 
B) a high resistance 
C) a switch connected in series 
D) All of the above choices are correct. 
E) None of the above choices are correct.

Question 16

A 4-ohm resistor is connected in parallel with a 6-ohm resistor.This combination produces an equivalent resistance of

Accepted Answer

A) 2)4 ohms. 
B) 4 ohms. 
C) 5 ohms. 
D) 5)5 ohms. 
E) 10 ohms. 
A) 2)4 ohms. 
B) 4 ohms. 
C) 5 ohms. 
D) 5)5 ohms. 
E) 10 ohms.

Question 17

Which statement is correct?

Accepted Answer

A) Charge flows in a closed circuit. 
B) Voltage flows through an open or a closed circuit. 
C) Resistance flows through an open circuit. 
D) Current is the primary cause of voltage. 
A) Charge flows in a closed circuit. 
B) Voltage flows through an open or a closed circuit. 
C) Resistance flows through an open circuit. 
D) Current is the primary cause of voltage.

Question 18

Heat a copper wire and its electric resistance

Accepted Answer

A) decreases. 
B) remains unchanged. 
C) increases. 
A) decreases. 
B) remains unchanged. 
C) increases.

Question 19

Compared to the amount of electric current in the filament of a lamp,the amount of current in the connecting wire is

Accepted Answer

A) definitely less. 
B) often less. 
C) actually more. 
D) the same. 
E) incredibly,all of these 
A) definitely less. 
B) often less. 
C) actually more. 
D) the same. 
E) incredibly,all of these

Question 20

A 60-W light bulb and a 100-W light bulb are connected in series to a 120 V outlet.Which light bulb has more current in it?

Accepted Answer

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

Exam 23: Electric Current

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

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

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

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

Modern automobile headlights are connected in

As more lamps are put into a parallel circuit,the overall current in the power source

When a 60-watt light bulb is connected to a 120-volt source the current in the light bulb is

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

On some early automobiles both headlights went out when one bulb burned out.The headlights must have been connected in

The headlights,radio,and defroster fan in an automobile are connected in

As more lamps are put into a series circuit,the overall current in the power source

The source of electrons lighting an incandescent ac light bulb is

What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?

What condition must exist between two points in a conductor in order to maintain a flow of charge?

A 4-ohm resistor is connected in parallel with a 6-ohm resistor.This combination produces an equivalent resistance of

Which statement is correct?

Heat a copper wire and its electric resistance

Compared to the amount of electric current in the filament of a lamp,the amount of current in the connecting wire is

A 60-W light bulb and a 100-W light bulb are connected in series to a 120 V outlet.Which light bulb has more current in it?

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