Science Ch.2 Book N

Front 1

What is any material that attracts iron or material containing iron?

Back 1

magnet

Front 2

What is the force which can cause attraction or repelling by moving charges?

Back 2

magnetic force

Front 3

What is one of 2 points, such as the ends of a magnet, that have opposing magnet in which magnetic force acts?

Back 3

magnetic pole

Front 4

What is a region around a magnet in which magnetic force acts?

Back 4

magnetic fiel

Front 5

What is the area of activity; area or magnetic field of an atom where its electic charges exist?

Back 5

domain

Front 6

How can materials become magnetized?

Back 6

-when domains line up
-rub iron in 1 direction with pole
-being under the influence of a magnetic field

Front 7

Describe some ways a magnet can become demagnetized.

Back 7

-dropping it
-increasing the temp.
-hitting it too hard
-putting it under the influence of a stronger magnet

Front 8

How does loss of magnetism occur?

Back 8

can occur cuz domains move and become random (they aren't lined up anymore)

Front 9

What do scientists think is the cause of the northern lights?

Back 9

charged particles from the sun hit our atmosphere, gain energy, and give off light

Front 10

What magnet is difficult to magnetize and keeps its magnetic property longer?

Back 10

permanent

Front 11

What magnet is easy to magnetize and looses magnetic property easily?

Back 11

temporary

Front 12

What do you end up with if you cut a bar magnet in half?

Back 12

2 magnets

Front 13

In what direction does the end of a compass needle always point?

Back 13

magnetic South and geographic North

Front 14

What is the interaction between electricity and magnetism?

Back 14

electromagnetism

Front 15

What is a coil that has a soft iron core and that acts as a magnet when an electric current is in the coil?

Back 15

electromagnet

Front 16

What is a coil of wire with an electric current in it?

Back 16

solenoid

Front 17

What is a device that converts electrical energy into mechanical energy?

Back 17

electric motor

Front 18

How can the strength of an electromagnet be increased?

Back 18

increase # of coils per meter in the solenoid

Front 19

What makes the armature in an electric motor rotate?

Back 19

magnet repels and attracts

Front 20

What reverses the direction of the electric current in a wire in the armature?

Back 20

commutator

Front 21

What measures or detects current?

Back 21

galvometer

Front 22

What electric current is made by a changing magnetic field?

Back 22

electromagnetic induction

Front 23

What uses electromagnet induction to change mechanical energy into electrical energy?

Back 23

electric generator

Front 24

How does a generator produce an electric current?

Back 24

coils turn in a magnetic field or magnet turns around coils

Front 25

How can the current produced by a generator be increased?

Back 25

increase # of coils or the speed at which they are turned

Front 26

What increases or decreases the voltage of AC?

Back 26

transformer

Front 27

What increases voltage and decreases current?

Back 27

step up transformer

Front 28

What decreases voltage and increases current?

Back 28

step down transformer

Front 29

In which transformer does the primary have fewer loops than the secondary?

Back 29

step up transformer

Front 30

In which transformer does the primary have more loops than the secondary?

Back 30

step down transformer

Front 31

How can an electric current be produced in a wire using magnetism?

Back 31

by moving the wires in a magnetic field or moving magnetic field around the wire

Front 32

What charges continually shift from flowing in one direction to flowing in the reverse direction?

Back 32

alternating current

Front 33

What charges always flow in the same direction?

Back 33

direct current

Front 34

An ___________ changes electrical energy into mechanical energy.

Back 34

electric motor

Front 35

A __________ changes mechanical energy into electrical energy.

Back 35

generator

Front 36

What are magnets made of metal with strong magnetic properties? What metals are in it?

Back 36

ferromagnet; magnetite, iron, nickel, and cobalt

Front 37

What is the cause of magnetism?

Back 37

-electrons are moving in atoms, this creates a magnetic field, when domains line up

Front 38

What is a coil of wire in an electric motor and is inside of a permanent magnet or electromagnet?

Back 38

armature

Front 39

Why is electricity sent through wires at high voltage?

Back 39

to decrease power loss

Front 40

What does electricity normally go through before it comes to the houses?

Back 40

2 step down transformers