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An electric diode is useful for


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

F) A) and D)
G) B) and E)

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


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

D) A) and B)
E) None of the above

Correct Answer

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Current in a conductor can be increased by


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

E) B) and C)
F) A) and D)

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


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

D) B) and C)
E) A) and B)

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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


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

F) B) and D)
G) A) and E)

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


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

E) A) and C)
F) C) and D)

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


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

D) A) and B)
E) A) and C)

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


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

F) C) and E)
G) C) and D)

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Modern automobile headlights are connected in


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

E) C) and D)
F) A) and C)

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Electric resistance in our skin is lowered when our skin is


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

D) All of the above
E) B) and C)

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


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

F) A) and D)
G) C) and D)

Correct Answer

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


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

D) A) and B)
E) A) and C)

Correct Answer

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To think of electric potential difference we are thinking about


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

D) All of the above
E) B) and C)

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


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

D) All of the above
E) B) and C)

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


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

D) None of the above
E) All of the above

Correct Answer

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In a circuit powered by a battery, charge


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

E) B) and C)
F) All of the above

Correct Answer

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Electrons flow in a wire when there is


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

E) A) and B)
F) None of the above

Correct Answer

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


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

E) C) and D)
F) All of the above

Correct Answer

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


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

D) None of the above
E) All of the above

Correct Answer

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