Electricity Ch. 1

Question 1

When amber was rubbed with some other materials, it became charged with a mysterious force. The charged amber attracted things such as…

Answer 1

dried leaves and wood shavings

Question 2

Around the middle 1700s, Benjamin Franklin called the two types of electricity ______ and ______.

Answer 2

positive, negative

Question 3

Scientists think that electricity is produced by very tiny particles called _______ and ______.

Answer 3

electrons, protons

Question 4

______ is anything that has weight and occupies space.

Answer 4

Matter

Question 5

_____ are the basic materials that make up all matter.

Answer 5

Elements

Question 6

Table salt is made from what two compounds?

Answer 6

Sodium, chlorine

Question 7

A molecule of water is two atoms of ______ and one atom of ______.

Answer 7

hydrogen, oxygen

Question 8

An atom contains three subatomic particles named?

Answer 8

electrons, protons, and neutrons

Question 9

If the atom of a(n) ______ is broke down any further, it would no longer exist in the particles that remain.

Answer 9

element

Question 10

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

Answer 10

protons

Question 11

The nucleus of an atom contains both ______ and ______.

Answer 11

protons, neutrons

Question 12

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

Answer 12

one-third, 1840 times, 1840 times

Question 13

Charges on atoms are called?

Answer 13

ions

Question 14

A positive ion contains ______ protons than electrons. A negative ion contains ______ protons than electrons.

Answer 14

more, less

Question 15

______ charges repel. ______ charges attract.

Answer 15

like, unlike

Question 16

The atoms of all known elements can have up to ______ shells

Answer 16

seven

Question 17

______ is the lightest element with only one electrons.

Answer 17

Hydrogen

Question 18

The second shell cannot hold more than ______ electrons.

Answer 18

eight

Question 19

The outer shell of an atom, also know as the ______

Answer 19

valence shell

Question 20

Atoms with only one valence electron make good ______.

Answer 20

conductors

Question 21

Insulators are materials from which electrons are very…

Answer 21

difficult to free

Question 22

Rubbing friction is supplied to the surface atoms of insulators such as glass and rubber, which can produce charges of static electricity. This is known as the ______.

Answer 22

triboelectric effect

Question 23

Electricity can be produced by ______ and ______.

Answer 23

light, magnetism

Question 24

A battery or ______ works on the principles of electrochemistry where chemicals(sulfuric acid and water) combine with certain metals to cause a chemical action that produces electric charges.

Answer 24

basic wet cell

Question 25

______ is the name given to the effect of pressure in causing electric charges.

Answer 25

Piezoelectricity

Question 26

______ is the method where heat is applied to the junction of two metals to provide more energy and more electrons to be freed.

Answer 26

thermoelectricity

Question 27

The speed of light is ______ miles per second.

Answer 27

186,000

Question 28

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

Answer 28

negative, positive

Question 29

When a conducting wire is put directly across the terminals of a battery or generator, a ______ is produced

Answer 29

short circuit

Question 30

Electron current flows from low potential to high potential, or…

Answer 30

Between any difference in potential.

Question 31

Electricity is the…

Answer 31

flow of electrons

Question 32

Light can be produced by electricity without much heat, by such methods as…

Answer 32

fluorescence, phosphorescence, and electroluminescence

Question 33

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

Answer 33

magnet

Question 34

A magnet can be demagnetized by…

Answer 34

being struck hard, heat energy, and rapidly reversing the magnetic field.

Question 35

A compass needle points to the ______.

Answer 35

north magnetic pole

Question 36

The magnetic field of a magnet is made up of lines of force that go from…

Answer 36

North to south flux lines

Question 37

A close wound solenoid will create a ______ magnetic field.

Answer 37

stronger

Question 38

A ______ has an extra set of contacts to keep current flowing through the relay even after the main switch is released.

Answer 38

holding relay

Question 39

A ______ operates similar to a relay except that the contacts are especially arranged so that the electromagnetic coil cannot stay energized continuously.

Answer 39

buzzer

Question 40

If a commutator is not used, the current coming out of the generator will…

Answer 40

change direction as the loop turns creating an alternating current.