chapter 19 study guide

Question 1

why are atoms considered to be electrically neutral?

Answer 1

atoms have equal numbers of protons and electrons

Question 1

when will two objects attract each other?

Answer 1

opposite charges attract

Question 2

a material through which electrons do not readily flow

Answer 2

insulator

Question 3

when does an electric field get stronger?

Answer 3

when it gets closer to a charge

Question 4

list one good example of a good conductor

Answer 4

copper

Question 5

why is copper used in household wiring?

Answer 5

low resistance

Question 6

which of the following has the least resistance: a short, thick metal wire or a long, narrow wire?

Answer 6

a thick copper wire has less electrical resistance than a thin copper wire of the same length

Question 7

resistance is measured in what unit?

Answer 7

ohm

Question 8

a path created for a current that only allows one route

Answer 8

series circuit

Question 9

a device designed to open an overloaded circuit and prevent overheating

Answer 9

circuit breaker

Question 10

a circuit that has two or more seperate paths for electros to follow

Answer 10

parallel circuit

Question 11

a material through which electrons can easily move

Answer 11

conductor

Question 12

list three examples of an insulator

Answer 12

rubber, glass, wood

Question 13

an atom has an equal number of protons and

Answer 13

electrons

Question 14

the process of providing a path to drain excess charge into Earth

Answer 14

grounding

Question 15

be able to identify the equation for ohm’s law

Answer 15

voltage=current x resistance

Question 16

if the distance between two charged objects increases, what happens to the electrical force between them?

Answer 16

it decreases

Question 17

when an object has more negative charge than positive charge

Answer 17

static charge

Question 18

lightning is an example of electrical

Answer 18

discharge

Question 19

if a current in a portable radio is 0.4 amperes, and the resistance of the circuit is 30 ohms, what is the voltage provided by the radio’s battery?

Answer 19

v=0.4x30.0=12 volts

Question 20

list some facts about the forces between charged objects

Answer 20

negative and positive objects attract. both negative or both positive will repel each other

Question 21

list one real-life example of a series circuit

Answer 21

a string of holiday lights

Question 22

what would a GFCI protect you from?

Answer 22

electric shock

Question 23

a simple circuit containing a light switch in the on position

Answer 23

closed

Question 24

what happens to positive and negative charges during a lightning strike?

Answer 24

negative charges build up at bottom of a cloud. positive charges build up on the ground. negative charges flow to the ground.

Question 25

classify metal and why its important in a wire

Answer 25

conductor; carries electricity

Question 26

classify plastic and why its important in a wire

Answer 26

insulator; protects current wire from shocking