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