Life Science Ch. 6 And 7 Test

Front 1

Electric Force

Back 1

The force between charged Objects.

Front 2

Electric Field

Back 2

The region around a charged object where the object’s electrical force is exerted on the other objects.

Front 3

Conductor

Back 3

A material that allows electricity to easily flow through it.

Front 4

Insulator

Back 4

A material that does not allow electricity to flow through it.

Front 5

Static electricity

Back 5

A buildup of charges on an object.

Front 6

Electric Current

Back 6

The continuous flow of electric charges through a material.

Front 7

Resistance

Back 7

The measurement of how difficult it is for charges to flow through an object.

Front 8

Voltage

Back 8

The difference in electrical potential energy per charge between two places in a circuit.

Front 9

Friction and an Example of Friction

Back 9

The transfer of electrons from one uncharged object to another uncharged object by rubbing.
Example: Socks rubbing against a floor.

Front 10

Conduction and an Example of Conduction

Back 10

A method of charging an object by allowing electrons to flow from one object to another object through direct contact.
Example: Lightning hitting the ground.

Front 11

Induction and an Example of Induction

Back 11

A method of redistributing the charge on an object by means of the electric field of another object; the objects have no direct contact.

Front 12

Give 3 Examples of Conductors

Back 12

Silver, Copper, and Gold.

Front 13

Give 3 Examples of Insulators

Back 13

Glass, Ceramics, and Rubber.

Front 14

Explain the Electrons in Conductors

Back 14

Electrons can move around freely.

Front 15

Explain the Electrons in Insulators

Back 15

Electrons can move around within their own atoms.

Front 16

Static Discharge and an Example of Static Discharge

Back 16

The loss of static electricity as electric charges transfer from one object to another.
Example: When lightning transfers from the clouds to the ground.

Front 17

How does Lightning form?

Back 17

During a storm air swirl violently. Water droplets within the clouds become charged. Electrons move from areas of negative charge to areas of positive charge, producing an intense spark. That spark is lightning.

Front 18

Similar Charges ____________ and Opposite Charges ____________.

Back 18

Repel; Attract

Front 19

What happens when Electric Charges flow through a material?

Back 19

It creates an Electric Current.

Front 20

What do Electric Charges produce?

Back 20

It creates an electric field.

Front 21

Three needed parts for Electric Circuit

Back 21

Resistor, Power Source; Wire

Front 22

What part of a circuit is nice, but not needed?

Back 22

Switch

Front 23

What is Ohm’s Law?

Back 23

Voltage Divided by Current = Resistance

Front 24

Four factors that determine Resistance of an Object

Back 24

-Diameter
-Length
-Temperature
-Material

Front 25

What are 3 things that protect you from fires in your home?

Back 25

-Third Prong
-Fuse
-Circuit Breaker

Front 26

Magnet

Back 26

Any material that attracts iron and materials that contain iron.

Front 27

Magnetic Field

Back 27

The area of magnetic force around a magnet.

Front 28

Magnetic Poles

Back 28

The two opposite ends of a magnet.

Front 29

Magnetic Force

Back 29

The attraction or repulsion between magnetic poles.

Front 30

Magnetic Declination

Back 30

The angle between Magnetic North and True North

Front 31

Compass

Back 31

A device with a magnetized needle that can spin freely. Its needle always points north.

Front 32

Electromagnetism

Back 32

The relationship between Electricity and Magnetism

Front 33

Solenoid

Back 33

A cylindrical coil of wire acting as a magnet when carrying electric current.

Front 34

Electromagnet

Back 34

A solenoid with a Ferromagnetic Core.

Front 35

What are the strongest parts of a magnet?

Back 35

Its poles.

Front 36

What happens if a magnet hangs freely on a string?

Back 36

The north pole of the magnet will turn to point to the magnetic north pole.

Front 37

What happens when you put magnets near each other?

Back 37

They create a magnetic force that either creates an attraction between the magnets or repulsion.

Front 38

With what unit do you measure Electric Current?

Back 38

Amperes

Front 39

What does the arrangement of domains in an object have to do with a magnet?

Back 39

If the domains are aligned in the same direction, then it is magnetic, but if they’re not all facing the same way then it isn’t magnetic.

Front 40

How can a magnet be demagnetized?

Back 40

-If you bend both poles together.
-Heating a magnet past its curie point.

Front 41

What happens if you cut a magnet?

Back 41

You will create two new poles, a north pole and a south pole. This will also create two magnets out of the magnet that you just cut.

Front 42

How is the Earth a magnet and why?

Back 42

It has to magnetic poles, a magnetic field, and a core.

Front 43

What kind of magnet can we compare the Earth to?

Back 43

A bar magnet.

Front 44

How does a doorbell work?

Back 44

When you ring the doorbell, an electric current flows through a wire. This electric current flows to a spring that will push an iron core with wire coil wrapped around it into a tone bar, and when you let go of the doorbell, the spring will stretch back to the other tone bar and that will make a second sound.

Front 45

What did Oersted Determine?

Back 45

Magnetism and electricity are related.

Front 46

What is the difference between a Solenoid and an Electromagnet?

Back 46

An electromagnet has a ferromagnetic core.

Front 47

4 ways to strengthen an Electromagnet

Back 47

-Make more loops with coil.
-Bring coil loops closer together.
-Increase the current.
-Use a more magnetic material for the core.

Front 48

Why is an Electromagnet very useful?

Back 48

If you want to pick up heavy metal objects, but can’t get them off a regular magnet, you could use an electromagnet. By using an electromagnet, you can turn it on or off so if I want to drop the heavy metal object I could just turn the electromagnet off.

Front 49

How are Electric Currents and Magnetic Fields Related?

Back 49

Electric current produce a magnetic field around it.

Front 50

Magnetic Field Lines

Back 50

Lines that map out the invisible magnetic field around a magnet.