science chapter 20

Question 1

any object that attracts the metal iron

Answer 1

magnet

Question 2

a place on a magnet where the force it applies is the strongest

Answer 2

magnetic pole

Question 3

The names of the two magnetic poles on all magnets

Answer 3

north pole and south pole

Question 4

A force of attraction of repulsion between the poles of two magnets

Answer 4

magnetic force

Question 5

An invisible magnetic field surrounds

Answer 5

all magnets, applying force on other magnets

Question 6

magnetic fields represented by

Answer 6

magnetic field lines

Question 7

what does assertion mean

Answer 7

forceful statement of fact or belief: to defend

Question 8

Any material that is strongly attracted to a magnet

Answer 8

magnetic material

Question 9

elements including iron, nickel, and cobalt, that have an especially strong attraction to magnets

Answer 9

Ferromagnetic elements

Question 10

not all materials are magnetic, but

Answer 10

a magnetic field surrounds all materials

Question 11

a region in a magnetic material in which the magnetic fields of the atoms all point in the same direction

Answer 11

magnetic domain

Question 12

A magnet that quickly loses its magnetic field after being removed from a magnetic field

Answer 12

temporary magnet

Question 13

A magnet that remains a magnet after being removed from another magnetic field

Answer 13

permanent magnet

Question 14

a magnet created by wrapping a current-carrying wire around a ferromagnetic core

Answer 14

electromagnet

Question 15

a special type of temporary magnet

Answer 15

electromagnet

Question 16

a device that uses an electric current to produce motion

Answer 16

electric motor

Question 17

a device that uses a magnetic field to transform mechanical energy to electric energy

Answer 17

electric generator

Question 18

electric current that flows in one direction

Answer 18

direct current

Question 19

electric current that changes direction in a regular pattern

Answer 19

alternating current

Question 20

a switch that rotates with the wire coil and prevents the current from changing directions

Answer 20

a commutator

Question 21

a shaft with a set of blades that spins when a stream of pressurized fluid strikes the blades

Answer 21

turbine

Question 22

a device that changes the voltage of an alternating current

Answer 22

transformer

Question 23

marconi

Answer 23

stole credit for radio

Question 24

niagara falls

Answer 24

tesla was interested in before america

Question 25

Eddison =

Answer 25

DC

Question 26

Tesla =

Answer 26

AC

Question 27

Westinghouse

Answer 27

allie of Tesla when he quit Edison business