Question 1

A lamp rated 23W 120V means that it will deliver 23 W

Accepted Answer

A) when the voltage across it is 120 V. 
B) whether or not it is connected to 120 V. 
C) as long as the current is ac. 
D) none of the above 
A) when the voltage across it is 120 V. 
B) whether or not it is connected to 120 V. 
C) as long as the current is ac. 
D) none of the above

Question 2

Modern automobile headlights are connected in

Accepted Answer

A) parallel. 
B) a perpendicular orientation. 
C) series. 
D) none of the above 
A) parallel. 
B) a perpendicular orientation. 
C) series. 
D) none of the above

Question 3

Although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is

Accepted Answer

A) a fraction of a centimeter per second. 
B) many centimeters per second. 
C) the speed of a sound wave. 
D) the speed of light. 
E) none of the above 
A) a fraction of a centimeter per second. 
B) many centimeters per second. 
C) the speed of a sound wave. 
D) the speed of light. 
E) none of the above

Question 4

Compared to a single lamp connected to a battery, two lamps connected in parallel 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 5

A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is

Accepted Answer

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

Question 6

Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs

Accepted Answer

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

Question 7

In a circuit powered by a battery, charge

Accepted Answer

A) flows through the battery. 
B) is energized by the battery. 
C) both of these 
D) neither of these 
A) flows through the battery. 
B) is energized by the battery. 
C) both of these 
D) neither of these

Question 8

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 9

A 60-W light bulb connected to a 120-V source draws a current of

Accepted Answer

A) 0.25 A. 
B) 0.5 A. 
C) 2.0 A. 
D) 4.0 A. 
E) more than 4 A. 
A) 0.25 A. 
B) 0.5 A. 
C) 2.0 A. 
D) 4.0 A. 
E) more than 4 A.

Question 10

The amount of current in an LED bulb rated 10.5W 120V is

Accepted Answer

A) less than 1 A. 
B) about 1 A. 
C) more then 1 A. 
A) less than 1 A. 
B) about 1 A. 
C) more then 1 A.

Question 11

Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the

Accepted Answer

A) lower resistance, and is brightest. 
B) lower resistance, but is dimmer. 
C) higher resistance, and is brightest. 
D) higher resistance, but is dimmer. 
E) none of the above 
A) lower resistance, and is brightest. 
B) lower resistance, but is dimmer. 
C) higher resistance, and is brightest. 
D) higher resistance, but is dimmer. 
E) none of the above

Question 12

If you wish to keep chicken warm in a shed on a cold night, the best lamp to use is

Accepted Answer

A) an incandescent lamp. 
B) a fluorescent lamp. 
C) an LED lamp. 
D) a CFL lamp. 
A) an incandescent lamp. 
B) a fluorescent lamp. 
C) an LED lamp. 
D) a CFL lamp.

Question 13

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

Accepted Answer

A) 60-W bulb 
B) 100-W bulb 
C) both the same. 
A) 60-W bulb 
B) 100-W bulb 
C) both the same.

Question 14

To think of electric potential difference we are thinking about

Accepted Answer

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

Question 15

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

Accepted Answer

A) 60-W bulb 
B) 100-W bulb 
C) both the same. 
A) 60-W bulb 
B) 100-W bulb 
C) both the same.

Question 16

An electric 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 17

Electric resistance in our skin is lowered when our skin is

Accepted Answer

A) moist. 
B) dry. 
C) none of the above 
A) moist. 
B) dry. 
C) none of the above

Question 18

Electrons flow in a wire when there is

Accepted Answer

A) an imbalance of charges in the wire. 
B) a potential difference across its ends. 
C) a difference in potential energy across its ends. 
D) none of the above 
A) an imbalance of charges in the wire. 
B) a potential difference across its ends. 
C) a difference in potential energy across its ends. 
D) none of the above

Question 19

Current in a conductor can be increased by

Accepted Answer

A) increasing the voltage across it. 
B) reducing its resistance. 
C) both of these 
D) neither of these 
A) increasing the voltage across it. 
B) reducing its resistance. 
C) both of these 
D) neither of these

Exam 23: Electric Current

A lamp rated 23W 120V means that it will deliver 23 W

Modern automobile headlights are connected in

Although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is

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

A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is

Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs

In a circuit powered by a battery, charge

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

A 60-W light bulb connected to a 120-V source draws a current of

The amount of current in an LED bulb rated 10.5W 120V is

Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the

If you wish to keep chicken warm in a shed on a cold night, the best lamp to use is

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

To think of electric potential difference we are thinking about

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

An electric diode is useful for

Electric resistance in our skin is lowered when our skin is

Electrons flow in a wire when there is

Current in a conductor can be increased by

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