Neets Module 1 Ch 1: Matter, Energy, And Electricity

Front 1

What is an element?

Back 1

a substance which cannot be reduced to a simpler substance by chemical means

Front 2

What is a compound?

Back 2

a chemical combination of elements which can be separated by chemical but not by physical means

Front 3

What is a mixture?

Back 3

a combination of elements and compounds, not chemically combined, that can be separated by physical
means

Front 4

What is a molecule

Back 4

a chemical combination of two or more atoms

Front 5

How is invisible light changed to visible light in a fluorescent light?

Back 5

invisible ultraviolet light photons bombard a phosphor coating on the inside of a glass tube. The phosphor electrons emit photons of light that are visible

Front 6

What determines the valence of an atom?

Back 6

the number of electrons in the outermost shell

Front 7

What is an ion?

Back 7

an atom that loses or gains electrons. (a positively or negatively charged atom or molecule)

Front 8

What determines whether a substance is a conductor or an insulator?

Back 8

the atomic structure of the material from
which the conductor is made

Front 9

How is a negative charge created in a neutral body?

Back 9

accumulation of excess electrons

Front 10

How are static charges created?

Back 10

friction

Front 11

What is the electrical charge of an atom which contains 8 protons and 11 electrons?

Back 11

Negative

Front 12

What is the relationship between charged bodies?

Back 12

like charges repel
unlike charges attract

Front 13

What is an electrostatic field?

Back 13

The space between and around charged bodies in which their influence is felt

Front 14

In what direction are electrostatic lines of force drawn?

Back 14

positive to negative

Front 15

What are some examples of electrical equipment which use magnetism?

Back 15

Motors, generators, speakers, computers, and televisions

Front 16

What are magnetic materials?

Back 16

materials which enables it to attract pieces of
iron

Front 17

What characteristics do all ferromagnetic materials have in common?

Back 17

relatively easy to magnetize

Front 18

What type of magnetic material should be used to make a temporary magnet?

Back 18

A material that offers low resistance and high permeability, such as iron or soft steel.

Front 19

What is retentivity?

Back 19

ability of a material to retain an amount of residual magnetism

Front 20

How does the law of magnetic poles relate to the law of electric charges?

Back 20

Like poles repel, unlike poles attract

Front 21

A compass is located at the geographical North Pole. In which direction would its needle point?

Back 21

To the magnetic north pole.

Front 22

Using Weber's molecular theory of magnetism, describe the polarity of the magnetic poles produced by stroking a magnetic material from right to left with the south pole of a magnet

Back 22

When a steel bar is stroked several times in the same
direction by a magnet, the magnetic force from the north pole of the magnet causes the molecules to align
themselves

Front 23

What is the difference between the domain theory and Weber's theory of magnetism?

Back 23

The domain theory is based on the electron spin principle; Weber's theory uses the concept of tiny molecular magnets.

Front 24

For what purpose would you sprinkle iron filings on the glass plate?

Back 24

To see magnetic field

Front 25

What pattern would be formed if sawdust was sprinkled on the glass instead of iron filings?

Back 25

No specific pattern

Front 26

What is a magnetic line of force?

Back 26

imaginary lines used to illustrate and describe the pattern of the magnetic
field

Front 27

In what way do magnetic lines of force differ from electrostatic lines of force?

Back 27

Electrostatic lines of force do not form closed loops

Front 28

How should a delicate instrument be protected from a magnetic field?

Back 28

By shielding or surrounding the instrument with a soft iron case, called a magnetic shield or screen

Front 29

How should bar magnets be stored?

Back 29

always stored in pairs with a north pole and a south pole placed together

Front 30

What is the definition of energy?

Back 30

The ability to do work

Front 31

What type of energy does a rolling stone have

Back 31

Kinetic

Front 32

What kind of energy does the stone have if it is at rest at the top of a hill?

Back 32

Potential

Front 33

What term describes voltage or emf?

Back 33

Difference of potential.

Front 34

Convert 2.1 kV to volts.

Back 34

2,100 volts

(1 kV = 1,000)

Front 35

Express the following in more simple terms.
a) 250,000 volts,
b) 25,000,000 microvolts
c) 0.001 millivolt.

Back 35

a) 250 kV
b) 25 V
c) 1 μV

Front 36

A device which supplies a voltage is commonly referred to by what name?

Back 36

A voltage source

Front 37

Name the six methods of producing a voltage

Back 37

Friction
Pressure
Heat
Light
Chemical Action
Magnetism

Front 38

The piezoelectric effect is an example of a voltage being produced by what method?

Back 38

Pressure

Front 39

A thermocouple is a device that produces voltage by what method?

Back 39

Heat

Front 40

A battery uses what method to produce a voltage?

Back 40

Chemical

Front 41

A generator uses what method to produce a voltage?

Back 41

Magnetic

Front 42

According to electron theory, an electric current flows from what potential to what potential?

Back 42

negative to positive

Front 43

The effects of directed drift take place at what rate of speed?

Back 43

The speed of light (186,000 miles per second, 300,000,000 meters per second).

Front 44

What is the relationship of current to voltage in a circuit?

Back 44

Current increases as voltage increases.

Front 45

Convert 350 mA to amperes

Back 45

0.35 amperes