# Chapter 23: Electric Current

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• 1.
Electrons are made to flow in a wire when there is
• A.

An imbalance of charges in the wire.

• B.

More potential energy at one end of the wire than the other.

• C.

A potential difference across its ends.

• 2.
An ampere is a unit of electrical
• A.

Pressure.

• B.

Current.

• C.

Resistance.

• D.

All of these

• E.

None of these

• 3.
A wire that carries an electric current
• A.

Is electrically charged.

• B.

May be electrically charged.

• C.

Is never electrically charged.

• 4.
A coulomb of charge that passes through a 6-volt battery is given
• A.

6 joules.

• B.

6 amperes.

• C.

6 ohms.

• D.

6 watts.

• E.

6 newtons.

• 5.
Which statement is correct?
• A.

Charge flows in a closed circuit.

• B.

Voltage flows through an open or a closed circuit.

• C.

Resistance flows through an open circuit.

• D.

Current is the primary cause of voltage.

• 6.
Electrons move in an electrical circuit
• A.

By being bumped by other electrons.

• B.

By colliding with molecules.

• C.

By interacting with an established electric field.

• D.

Because the wires are so thin.

• E.

None of these

• 7.
Stretch a copper wire so that it is thinner and the resistance between its ends
• A.

Decreases.

• B.

Remains unchanged.

• C.

Increases.

• 8.
Heat a copper wire and its electric resistance
• A.

Decreases.

• B.

Remains unchanged.

• C.

Increases.

• 9.
A wire carrying a current is normally charged
• A.

Negatively.

• B.

Positively.

• C.

Not at all.

• 10.
In an ac circuit, the electric field
• 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

• 11.
The current through a 10-ohm resistor connected to a 120-V power supply is
• A.

1 A.

• B.

10 A.

• C.

12 A.

• D.

120 A.

• E.

None of these

• 12.
A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
• A.

5 V

• B.

10 V

• C.

15 V

• D.

20 V

• E.

More than 20 V

• 13.
When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value?
• A.

2 ohms

• B.

5 ohms

• C.

10 ohms

• D.

20 ohms

• E.

More than 20 ohms

• 14.
The primary source of electrons in an ordinary electrical circuit is
• 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

• 15.
The source of electrons lighting an incandescent ac light bulb is
• A.

The power company.

• B.

Electrical outlet.

• C.

Atoms in the light bulb filament.

• D.

The wire leading to the lamp.

• E.

The source voltage.

• 16.
A woman experiences an electrical shock. The electrons making the shock come from the
• A.

Woman's body.

• B.

Ground.

• C.

Power plant.

• D.

Hairdryer.

• E.

Electric field in the air.

• 17.
In a common dc circuit, electrons move at speeds of
• 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

• 18.
When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
• A.

The speed of sound waves in metal.

• B.

The speed of light.

• C.

1000 cm/s.

• D.

Less than 1 cm/s.

• E.

Dependent on how quickly each electron bumps into the next electron.

• 19.
Alternating current is normally produced by a
• A.

Battery.

• B.

Generator.

• C.

Both of these

• D.

Neither of these

• 20.
The electric power of a lamp that carries 2 A at 120 V is
• A.

1/6 watts.

• B.

2 watts.

• C.

60 watts.

• D.

20 watts.

• E.

240 watts.

• 21.
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
• A.

More than the resistance of either lamp.

• B.

Less than the resistance of either lamp.

• C.

None of these

• 22.
When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
• A.

More than the resistance of either lamp.

• B.

Less than the resistance of either lamp.

• C.

None of these

• 23.
On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
• A.

Parallel.

• B.

Perpendicular.

• C.

Series.

• D.

Haste.

• 24.
Modern automobile headlights are connected in
• A.

Parallel.

• B.

Perpendicular.

• C.

Series.

• D.

None of these

• 25.
There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
• A.

Different electrons; the ones that flow in the circuit to your lamp.

• B.

The same electrons.

• C.

The positive charges that flow in the filament.

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