Electricity 1-7 Ch 1

Question 1

They noticed that when ______was rubbed with some other materials, it became charged. It attracted dried leaves and wood shavings.

Answer 1

Amber

Question 2

______ are materials from which electrons are very difficult to free.

Answer 2

Insulators

Question 3

Benjamin Franklin called the two kinds of electricity _______ and _______.

Answer 3

Positive, negative

Question 4

Today, scientist, think electricity is produced by very tiny particles called _______ and _______.

Answer 4

Electrons, protons

Question 5

Matter is anything that has ______ and occupies _____.

Answer 5

Weight, space

Question 6

What is the name of basic materials that make up all matter?

Answer 6

Elements

Question 7

Water for example is a ______ that is made from the element hydrogen and the element oxygen.

Answer 7

Compound

Question 8

Ordinary table salt is made from the elements ______ and ______.

Answer 8

Sodium, chlorine

Question 9

An atom contains what three types of subatomic particles that are of interest in electricity?

Answer 9

Electrons, protons, and neutrons

Question 10

The ______ and ______ are located in the nucleus. The ______ travel about the nucleus in orbits.

Answer 10

Protons / neutrons
Electrons

Question 11

The number of ______ in the nucleus, determine how one atom of an element differs from another.

Answer 11

Protons

Question 12

The proton is ______ the diameter of an electron, but it has almost ______ times the mass of an electron. The proton is almost ______ heavier than the electron.

Answer 12

One-third
1840
1840

Question 13

___________ is the name given to the effective pressure in causing electrical charges.

Answer 13

Piezoelectricity

Question 14

A proton ______ another proton.
An electron ______ another electron.
A proton ______ an electron.

Answer 14

Repels
Repels
Attracts

Question 15

If an atom has four electrons and an equal number of protons, what charge does the atom have?

Answer 15

They cancel out and the atom has no charge

Question 16

Charged atoms are called?

Answer 16

Ions

Question 17

The atoms of unknown elements can have up to how many shells?

Answer 17

Seven

Question 18

How many electron shells does hydrogen have?

Answer 18

One

Question 19

How many electrons does copper have?

Answer 19

29

Question 20

The atoms of ______ have only one or two valence electrons.

Answer 20

Conductors

Question 21

The second shell of an atom cannot hold more than how many electrons?

Answer 21

Eight

Question 22

Atoms with only one valence electron are the ______ electrical conductors?

Answer 22

Best

Question 23

What is the name of the outer shell of an atom? And the electrons in that shell are called what?

Answer 23

Valence shell
Valence electrons

Question 24

Light is generally considered by many scientist to be made of small particles of energy called ______.

Answer 24

Photons

Question 25

Free electrons moving in the same direction produce what?

Answer 25

An electric current

Question 26

How fast does electric current travel?

Answer 26

The speed of light; 186,000 miles per second

Question 27

An electron leaves the ______ side of the battery for each electron that enters the ______ side.

Answer 27

Negative Positive

Question 28

What happens when a conducting wires put directly across the terminals of a battery or generator?

Answer 28

Short circuit

Question 29

The electrical charge that an object gets is determined by the number of electrons that the object ______ or ______.

Answer 29

Lost Gained

Question 30

Electron current flows from a ___ ______ to a ___ ______ , or between any difference of potential.

Answer 30

Low potential High potential

Question 31

What are three ways light can be produced without much heat?

Answer 31

Fluorescence Phosphorescence Electroluminescence

Question 32

Any conductor that carries an electric current will act like a ______.

Answer 32

Magnet * Electromagnetism *

Question 33

How do you demagnetize a magnet?

Answer 33

Striking, heating, rapidly reversing field

Question 34

A compass needle points to what?

Answer 34

It aligns to the earths magnetic North Pole by a tiny, light, freely pivoted magnet

Question 35

The north pole is produced on the side that the _______ _______ come out

Answer 35

Flux lines

Question 36

A close wound solenoid will create a stronger what?

Answer 36

Magnetic field

Question 37

What really has an extra set of context to keep current flow flowing through the relay after the main switches released?

Answer 37

Holding relay

Question 38

The buzzer operates similarly to the relay, except the _______ or special arrangement so that the electromagnetic _______ cannot stay energized continuously.

Answer 38

Contacts, coil

Question 39

If a commutator is not used, the current coming out of the generator will ______ ______ as the loop turns. This is called ______ ______.

Answer 39

Change direction Alternating current