Question 1

The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was

Accepted Answer

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

Question 2

The cause of electrical shock is predominantly

Accepted Answer

A)  excess current.
B)  excess voltage.
C)  reduced resistance.
D)  none of the above

Question 3

One kilowatt-hour is a unit of

Accepted Answer

A)  energy.
B)  power.
C)  voltage.
D)  current.
E)  resistance.

Question 4

Current that is typically 60 hertz is

Accepted Answer

A)  direct current.
B)  alternating current.
C)  either of these
D)  neither of these

Question 5

Three resistors take the shape of a triangle, one resistor in each leg. Resistance in one leg is 4 ohms, 6 ohms in a second leg, and a third leg 10 ohms. Connecting an ohm-meter across the 10-ohm resistor will show the equivalent resistance to be

Accepted Answer

A)  1.4 ohms.
B)  5 ohms.
C)  6.7 ohms.
D)  greater than 6.7 ohms.

Question 6

One kilowatt is a unit of

Accepted Answer

A)  energy.
B)  power.
C)  voltage.
D)  current.
E)  resistance.

Question 7

Sometimes the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when

Accepted Answer

A)  too many lamps are connected in series.
B)  too many lamps are connected in parallel.
C)  too much current is drawn by the battery.

Question 8

The source of electrons in a simple electric circuit is

Accepted Answer

A)  the voltage source.
B)  energy stored in the voltage source.
C)  energy released by the voltage source.
D)  the electrical circuit itself.
E)  none of the above

Question 9

The power consumed by a device drawing 0.8 A when connected to 120 V is

Accepted Answer

A)  12 W.
B)  15 W.
C)  60 W.
D)  96 W.
E)  120 W.

Question 10

A 4-ohm and 6-ohm resistor connected in parallel have an equivalent resistance of

Accepted Answer

A)  2.4 ohms.
B)  4 ohms.
C)  5 ohms.
D)  5.5 ohms.
E)  10 ohms.

Question 11

The unit of electrical resistance is the

Accepted Answer

A)  volt.
B)  ampere.
C)  ohm.
D)  none of the above

Question 12

Which is more dangerous, touching a faulty 110-volt light fixture, or a Van de Graaff generator charged to 100,000 volts?

Accepted Answer

A)  touching the light fixture
B)  touching the generator
C)  touching both are about equally dangerous.

Question 13

If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be

Accepted Answer

A)  half its normal value.
B)  the same as its normal value.
C)  twice its normal value.
D)  none of the above

Question 14

An ampere is a unit of electric

Accepted Answer

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

Question 15

If you stretch a copper wire so that it is thinner, the resistance between its ends

Accepted Answer

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

Question 16

One joule per coulomb is a unit of

Accepted Answer

A)  energy.
B)  power.
C)  voltage.
D)  current.
E)  resistance.

Question 17

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

Question 18

Just as water flows from a region of high pressure to a region of low pressure, electric charge flows from a region of

Accepted Answer

A)  high electric pressure to a region of low electric pressure.
B)  high potential energy to a region of low potential energy.
C)  deep to shallow regions.
D)  all of the above

Question 19

Connect a pair of lamps in series and current is drawn from the battery. Connect the same lamps in parallel and the current drawn is

Accepted Answer

A)  less.
B)  the same.
C)  more.
D)  sometimes more, sometimes less.

Question 20

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

Exam 23: Electric Current

Just as water flows from a region of high pressure to a region of low pressure, electric charge flows from a region of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

One joule per coulomb is a unit of

Correct AnswerverifiedShow Answer

One kilowatt is a unit of

Correct AnswerverifiedShow Answer

Which is more dangerous, touching a faulty 110-volt light fixture, or a Van de Graaff generator charged to 100,000 volts?

Correct AnswerverifiedShow Answer

An ampere is a unit of electric

Correct AnswerverifiedShow Answer

If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be

Correct AnswerverifiedShow Answer

A 4-ohm and 6-ohm resistor connected in parallel have an equivalent resistance of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The source of electrons in a simple electric circuit is

Correct AnswerverifiedShow Answer

Current that is typically 60 hertz is

Correct AnswerverifiedShow Answer

The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was

Correct AnswerverifiedShow Answer

The power consumed by a device drawing 0.8 A when connected to 120 V is

Correct AnswerverifiedShow Answer

The unit of electrical resistance is the

Correct AnswerverifiedShow Answer

Sometimes the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when

Correct AnswerverifiedShow Answer

The cause of electrical shock is predominantly

Correct AnswerverifiedShow Answer

One kilowatt-hour is a unit of

Correct AnswerverifiedShow Answer

Three resistors take the shape of a triangle, one resistor in each leg. Resistance in one leg is 4 ohms, 6 ohms in a second leg, and a third leg 10 ohms. Connecting an ohm-meter across the 10-ohm resistor will show the equivalent resistance to be

Correct AnswerverifiedShow Answer

Connect a pair of lamps in series and current is drawn from the battery. Connect the same lamps in parallel and the current drawn is

Correct AnswerverifiedShow Answer

If you stretch a copper wire so that it is thinner, the resistance between its ends

Correct AnswerverifiedShow Answer

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The number of electrons delivered daily to an average American home by an average power utility in the early 21^st century was

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