Question 1

The source of electrons that illuminate a common lamp in your home is

Accepted Answer

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

Question 2

The voltage across a 10-ohm resistor carrying 5 A is

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 3

The energy dissipated in a light bulb in a circuit is provided by the

Accepted Answer

A) lamp filament itself. 
B) wires leading to the lamp. 
C) voltage source. 
D) none of the above 
A) lamp filament itself. 
B) wires leading to the lamp. 
C) voltage source. 
D) none of the above

Question 4

The electric field established by a battery in a dc circuit

Accepted Answer

A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) acts in one direction. 
D) is non-existent. 
E) none of the above 
A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) acts in one direction. 
D) is non-existent. 
E) none of the above

Question 5

The current produced by voltage in a circuit is impeded by

Accepted Answer

A) electric barriers. 
B) closed switches. 
C) electric resistance. 
D) none of the above 
A) electric barriers. 
B) closed switches. 
C) electric resistance. 
D) none of the above

Question 6

A capacitor is useful in

Accepted Answer

A) boosting the energy output of a circuit. 
B) increasing the current in a resistor. 
C) smoothing pulsed current. 
D) changing dc to ac in a circuit. 
E) increasing or decreasing voltage. 
A) boosting the energy output of a circuit. 
B) increasing the current in a resistor. 
C) smoothing pulsed current. 
D) changing dc to ac in a circuit. 
E) increasing or decreasing voltage.

Question 7

When a 12-V battery powers a single 6-ohm lamp,

Accepted Answer

A) 2 joules flow in the lamp each second. 
B) 6 joules flow in the lamp each second. 
C) 12 joules flow in the lamp each second. 
D) none of the above 
A) 2 joules flow in the lamp each second. 
B) 6 joules flow in the lamp each second. 
C) 12 joules flow in the lamp each second. 
D) none of the above

Question 8

A lamp rated at 120W 120V has a filament resistance of

Accepted Answer

A) 1 ohm. 
B) 60 ohms. 
C) 100 ohms. 
D) 144 ohms. 
E) none of the above 
A) 1 ohm. 
B) 60 ohms. 
C) 100 ohms. 
D) 144 ohms. 
E) none of the above

Question 9

Power is defined as the energy expended per unit of time. When translated to electrical terms, power is equal to

Accepted Answer

A) current multiplied by resistance. 
B) current multiplied by voltage. 
C) current divided by time. 
D) voltage divided by time. 
E) none of the above 
A) current multiplied by resistance. 
B) current multiplied by voltage. 
C) current divided by time. 
D) voltage divided by time. 
E) none of the above

Question 10

Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is

Accepted Answer

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

Question 11

The brightness of a lamp is directly related to its

Accepted Answer

A) brand. 
B) place of manufacture. 
C) power rating. 
D) all of the above 
E) none of the above 
A) brand. 
B) place of manufacture. 
C) power rating. 
D) all of the above 
E) none of the above

Question 12

Alternating current is normally produced by a

Accepted Answer

A) battery. 
B) generator. 
C) both of these 
D) neither of these 
A) battery. 
B) generator. 
C) both of these 
D) neither of these

Question 13

The drift speed of electrons that compose current in a flashlight is about

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) any of the above under different conditions. 
A) the speed of sound waves in metal. 
B) the speed of light. 
C) 1000 cm/s. 
D) less than 1 cm/s. 
E) any of the above under different conditions.

Question 14

The source of energy that illuminates a lamp in your home is

Accepted Answer

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

Question 15

As more lamps are connected in 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 16

Electrons that are energized to glow in the filament of a common ac lamp are

Accepted Answer

A) supplied by a wall outlet. 
B) supplied by a wall outlet, which in turn are supplied by your power company. 
C) electrons already in the filament. 
D) none of the above 
A) supplied by a wall outlet. 
B) supplied by a wall outlet, which in turn are supplied by your power company. 
C) electrons already in the filament. 
D) none of the above

Question 17

The electric field established by a generator in an ac circuit

Accepted Answer

A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) acts in one direction. 
D) is non-existent. 
E) none of the above 
A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) acts in one direction. 
D) is non-existent. 
E) none of the above

Question 18

When a pair of 1-ohm resistors are connected in series, their equivalent (combined)resistance is 2 ohms, and when connected in parallel is

Accepted Answer

A) ½ ohm. 
B) none of the above 
C) also 2 ohms. 
A) ½ ohm. 
B) none of the above 
C) also 2 ohms.

Question 19

For electric current in the home, your power company supplies

Accepted Answer

A) energy. 
B) electrons. 
C) both of these 
D) neither of these 
A) energy. 
B) electrons. 
C) both of these 
D) neither of these

Question 20

In units of measurement, power in watts is equal to

Accepted Answer

A) amperes x ohms. 
B) amperes x volts. 
C) amperes/second. 
D) volts/second. 
E) none of the above 
A) amperes x ohms. 
B) amperes x volts. 
C) amperes/second. 
D) volts/second. 
E) none of the above

Exam 23: Electric Current

The source of electrons that illuminate a common lamp in your home is

The voltage across a 10-ohm resistor carrying 5 A is

The energy dissipated in a light bulb in a circuit is provided by the

The electric field established by a battery in a dc circuit

The current produced by voltage in a circuit is impeded by

A capacitor is useful in

When a 12-V battery powers a single 6-ohm lamp,

A lamp rated at 120W 120V has a filament resistance of

Power is defined as the energy expended per unit of time. When translated to electrical terms, power is equal to

Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is

The brightness of a lamp is directly related to its

Alternating current is normally produced by a

The drift speed of electrons that compose current in a flashlight is about

The source of energy that illuminates a lamp in your home is

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

Electrons that are energized to glow in the filament of a common ac lamp are

The electric field established by a generator in an ac circuit

When a pair of 1-ohm resistors are connected in series, their equivalent (combined)resistance is 2 ohms, and when connected in parallel is

For electric current in the home, your power company supplies

In units of measurement, power in watts is equal to

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