1 Fundamentals of Electricity: Unit 1 - Atomic Structure

Matter can exist in two states: solid and liquid

True

Matter has mass and occupies space.

True

An element cannot be chemically subdivided into other elements. The smallest amount of an element is a(n) _____.

atom

Objects charged with the different type of charges will draw towards each others. This is referred to as _____.

attraction.

A conductor is normally made of atoms with _____ electrons in the valance shell.

between 1 & 3 (less then 4)

The part of an atom that has a negative charge is the _____.

electron

The three principle parts of an atom are _____, _____ & _____.

electron, proton & neutron

Electricity is the flow of _____.

electrons

The most common method of producing electricity is through the use of _____.

magnetism

The part of an atom that has no charge is the _____.

neutron

The nucleus of an atom contains _____ and _____.

neutrons and protons

The valance shell of an atom is the _____ shell.

outer

The part of an atom that has a positive charge is the _____.

proton

The atomic number of an element is the number of _____ in the nucleus.

protons

The law of charges states that like charges _____ and opposite (unlike) charges _____.

repel; attract

Objects charged with the same type of charge will push each other away. This is referred to as _____.

repulsion

Valance electrons are contained in the _____ shell.

valance

An insulator is normally an atom with _____ or _____ electrons in the valance shell.

7 or 8 (more then 4)

The effects of static electricity (electrical charges) were noticed by the Greeks about _____ years ago.

2500

A semiconductor is normally an atom with _____ electrons in the valance shell.

4 valance

Current that flows in both directions is called bidirectional. It is also referred to as _____ current.

AC

There are two types of electrical sources: one of them is DC; the other is _____.

AC

Alternating current is described as _____.

Bidirectional

Current that flows in only one direction is called unidirectional. It is also referred to as _____ current.

DC

Direct current is described as _____.

Unidirectional