Chapter 7 HW

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The current through a 10-ohm resistor connected to a 120-V power supply is

12 A

The amount of energy given to each coulomb of charge flowing through a 12-V battery is

12 J

A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated in the line is

12,800 W

Two charges separated by 1 m exert a 1.0-N force on each other. If the charges are pushed to 0.25-m separation, the force on each charge will be

16 N

A pair of 1-ohm resistors connected in parallel has a combined resistance of

2 ohms

The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is

220 ohms

A length of wire has resistance R. The same wire twice as long has resistance

2R

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

36 W

A resistor carries a current of 2 A when connected to a 10-V battery. What is the resistor's value?

5 ohms

Electrons flow in a wire when there is

A potential difference across its ends

When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons

Already exists in the wire

The electric charge on all electrons

Are identical

An electron and a proton

Attract each other

To say that electric charge is conserved is to say that electric charge

Can neither be created nor destroyed

The electric field in the wires of an ac circuit

Changes direction with time

The electric force between charges is strongest when the charges are

Close together

An ampere is a unit of electric

Current

A balloon will stick to a wooden wall if the balloon is charged

Either (positive and negative)

Which force binds atoms together to form molecules?

Electric

A positive ion has a deficiency of

Electrons

The number of protons in the nucleus of an electrically neutral atom is equal to the number of

Electrons that surround the nucleus

Two charged particles repel each other with a force F. If the charge on one particle is doubled and the distance between them is doubled, the force will be

F/2

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

High to low voltage

As more lamps are put into a parallel circuit, the overall current in the power source

Increases

Heat a copper wire and its electric resistance

Increases

Electric potential is measured in units of

Joules

The electric force between charges depends on the

Magnitude of electric charges and separation distance between electric charges (BOTH)

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

More than the resistance of either lamp

A difference between an insulator and a conductor is that a conductor has more A) electrons than protons. B) protons than electrons. C) energy than an insulator. D) faster moving molecules. E) None of the above

None of the above

The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is A) half as much. B) the same. C) twice as much. D) four times as much. E) none of the above

None of the above

The headlights, radio, and defroster fan in an automobile are connected in

Parallel

As you comb your hair, electrons are rubbed onto the comb, which becomes

Positively

When you remove electrons from a metal cup, the cup becomes

Positively Charged

A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can then becomes

Positively charged

A difference between electric and gravitational forces is that electric forces include

Repulsive interactions

Two charged particles near each other are released. As they move, the force on each particle increases. Therefore, the particles have

The opposite sign


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