Ch 8 HW

If you use 10J of work to push a coulomb of change into an electric field, its voltage with respect to its starting position is

10V

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

12A

Electrons are made to flow in a wire when there is

a potential difference across its ends

The unit of electric charge, the coulomb, is the charge on

a specific large number of electrons

Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the

both voltages are the same

Electrons move in an electrical circuit

by interacting with an established electric field

In an ac(alternating current) circuit, the electric field

changes magnitude and direction with time

The electrical force between charges is strongest when the charges are

close together

An ampere is a unit of electrical

current

Which statement is correct?

current flows through a circuit

Stretch a copper wire so that it is thinner and the resistance between its ends

increases

To say that an object is electrically polarized is to say

its charges have been rearranged

Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the

its the same in each lamp

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

less than the resistance of either lamp

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

more than 20V

To say that electric charge is conserved means that no case has ever been found where

net charge has been created or destroyed

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

series

To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with

steel

Two lamps, one with a thick filament, and one with a thin filament, are connected in parallel to a battery. The current is largest in the lamp with the

thick filament

Two lamps, one with a thick filament, and one with a thin filament are connected in series to a battery. The voltage is greater across the lamp with the

thin filament

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

240 W

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

6 joules

Which force binds atoms together to form molecules?

electrical

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

electrons that surround the nucleus

You can touch a 100,000-V Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of

energy

The electrical field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is

not 1/2, the same, twice, or 4 times as much

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 finger. The can is then

positively charged

When the distance between two charges is halved, the electrical force between the charges

quadruples

A main difference between gravitational and electric forces is that electrical forces

repel or attract

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

woman's body