Question 1

When we say an appliance "uses up electricity," we really are saying that

Accepted Answer

A) current disappears. 
B) electric charges are dissipated. 
C) the main power supply voltage is lowered. 
D) electrons are removed from the circuit and placed elsewhere. 
E) electron kinetic energy is changed into heat. 
A) current disappears. 
B) electric charges are dissipated. 
C) the main power supply voltage is lowered. 
D) electrons are removed from the circuit and placed elsewhere. 
E) electron kinetic energy is changed into heat.

Question 2

Two lamps,one with a thick filament and one with a thin filament of the same material,are connected in series to a battery.The voltage is

Accepted Answer

A) greater across the lamp with the thick filament. 
B) greater across the lamp with the thin filament. 
C) the same for both lamps. 
A) greater across the lamp with the thick filament. 
B) greater across the lamp with the thin filament. 
C) the same for both lamps.

Question 3

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 4

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

Question 5

In a common dc circuit,electrons move at speeds of

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 these 
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 these

Question 6

An electric heater is rated at 300 W when used in a 110-V circuit.The safety fuse in the circuit can handle 15 A of current.How many heaters can be safely operated in the circuit?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5 
A) 2 
B) 3 
C) 4 
D) 5 
E) more than 5

Question 7

The primary source of electrons in an ordinary electrical circuit is

Accepted Answer

A) a dry cell,wet cell or battery. 
B) the back emf of motors. 
C) the power station generator. 
D) the electrical circuit itself. 
E) none of these 
A) a dry cell,wet cell or battery. 
B) the back emf of motors. 
C) the power station generator. 
D) the electrical circuit itself. 
E) none of these

Question 8

In an electric circuit,the safety fuse is connected to the circuit in

Accepted Answer

A) series. 
B) parallel. 
C) either series or parallel. 
A) series. 
B) parallel. 
C) either series or parallel.

Question 9

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) switching 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) switching dc to ac in a circuit. 
E) increasing or decreasing voltage.

Question 10

In an ac circuit,the electric field

Accepted Answer

A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) is the same everywhere. 
D) is non-existent. 
E) none of these 
A) increases via the inverse-square law. 
B) changes magnitude and direction with time. 
C) is the same everywhere. 
D) is non-existent. 
E) none of these

Question 11

Connect a pair of lamps in series and you draw current from the connected battery.Connect the same lamps in parallel and you draw

Accepted Answer

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

Question 12

Compared to the resistance of two resistors connected in series,the same two resistors connected in parallel have

Accepted Answer

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

Question 13

A capacitor is used to store

Accepted Answer

A) both charge and energy. 
B) energy. 
C) charge. 
D) neither charge nor energy. 
A) both charge and energy. 
B) energy. 
C) charge. 
D) neither charge nor energy.

Question 14

A sphere has a negative charge of 6.4 × 10-7 coulomb.The approximate number of electrons that must be removed to make the sphere neutral is

Accepted Answer

A) 1)6 × 10-8. 
B) 9)8 × 103. 
C) 6)4 × 1026. 
D) 4)0 × 1012. 
A) 1)6 × 10-8. 
B) 9)8 × 103. 
C) 6)4 × 1026. 
D) 4)0 × 1012.

Question 15

In a simple circuit containing a bulb,energy is given to the moving charges by

Accepted Answer

A) the bulb. 
B) the wires. 
C) a generator. 
D) none of these 
A) the bulb. 
B) the wires. 
C) a generator. 
D) none of these

Question 16

A circuit is powered with a battery.Charge flows

Accepted Answer

A) out of the battery and into the circuit. 
B) from the negative battery terminal to the positive terminal. 
C) only after a couple seconds pass. 
D) through both the battery and the rest of the circuit. 
E) none of these 
A) out of the battery and into the circuit. 
B) from the negative battery terminal to the positive terminal. 
C) only after a couple seconds pass. 
D) through both the battery and the rest of the circuit. 
E) none of these

Question 17

The power dissipated in a 4-ohm resistor carrying 3 A is

Accepted Answer

A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) not enough information to say 
A) 7 W. 
B) 18 W. 
C) 36 W. 
D) 48 W. 
E) not enough information to say

Question 18

A wire carrying a current is normally charged

Accepted Answer

A) negatively. 
B) positively. 
C) not at all. 
A) negatively. 
B) positively. 
C) not at all.

Question 19

A coulomb of charge that passes through a 6-volt battery is given

Accepted Answer

A) 6 joules. 
B) 6 amperes. 
C) 6 ohms. 
D) 6 watts. 
E) 6 newtons. 
A) 6 joules. 
B) 6 amperes. 
C) 6 ohms. 
D) 6 watts. 
E) 6 newtons.

Question 20

When a 10-V battery is connected to a resistor,the current in the resistor is 2 A.What is the resistor's value?

Accepted Answer

A) 2 ohms 
B) 5 ohms 
C) 10 ohms 
D) 20 ohms 
E) more than 20 ohms 
A) 2 ohms 
B) 5 ohms 
C) 10 ohms 
D) 20 ohms 
E) more than 20 ohms

Exam 23: Electric Current

When we say an appliance "uses up electricity," we really are saying that

Two lamps,one with a thick filament and one with a thin filament of the same material,are connected in series to a battery.The voltage is

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

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

In a common dc circuit,electrons move at speeds of

An electric heater is rated at 300 W when used in a 110-V circuit.The safety fuse in the circuit can handle 15 A of current.How many heaters can be safely operated in the circuit?

The primary source of electrons in an ordinary electrical circuit is

In an electric circuit,the safety fuse is connected to the circuit in

A capacitor is useful in

In an ac circuit,the electric field

Connect a pair of lamps in series and you draw current from the connected battery.Connect the same lamps in parallel and you draw

Compared to the resistance of two resistors connected in series,the same two resistors connected in parallel have

A capacitor is used to store

A sphere has a negative charge of 6.4 × 10-7 coulomb.The approximate number of electrons that must be removed to make the sphere neutral is

In a simple circuit containing a bulb,energy is given to the moving charges by

A circuit is powered with a battery.Charge flows

The power dissipated in a 4-ohm resistor carrying 3 A is

A wire carrying a current is normally charged

A coulomb of charge that passes through a 6-volt battery is given

When a 10-V battery is connected to a resistor,the current in the resistor is 2 A.What is the resistor's value?

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