Chapter 1: Fundamentals of Electricity
MULTIPLE CHOICE
1. The chemical combination of two or more elements is called a(n) ____.
a.
mixture
c.
molecule
b.
compound
d.
atom
2. A(n) ____ is a substance that cannot be reduced to a simpler substance by chemical means.
a.
element
c.
molecule
b.
compound
d.
atom
3. An example of a compound is ____.
a.
carbon dioxide
c.
salt
b.
tungsten
d.
salt water
4. The number of protons in the nucleus of the atom is called the element’s ____.
a.
atomic number
c.
atomic mass
b.
atomic weight
d.
relative atomic mass
5. An atom having seven electrons in the valence shell is ____ conductive than an atom having three
electrons in the valence shell.
a.
equally as
c.
more
b.
less
d.
not enough information is given
6. The symbol ____ is used in electronics to represent voltage.
a.
V
c.
b.
C
d.
E
7. Current is measured in ____.
a.
coulombs
c.
amperes
b.
ohms
d.
volts
8. The source that creates an excess of electrons (negative charge) at one end of a conductor and a
deficiency of electrons (positive charge) at the opposite end represents the ____.
a.
potential
c.
electromotive force
b.
difference of potential
d.
voltage
9. The actual work accomplished in a circuit is a result of the ____ available at the two ends of a
conductor.
a.
potential
c.
electromotive force
b.
difference of potential
d.
voltage
10. Materials that have many free electrons and offer little resistance to current flow are called ____.
a.
conductors
c.
semiconductors
b.
insulators
d.
circuits
COMPLETION
1. A perfect insulator will have atoms with ____________________ valence shells.
2. ____________________ is the process of gaining or losing electrons.
3. __________ is the force that moves the electrons in the circuit.
SHORT ANSWER
1. Describe why the conductivity of an atom depends on its valence band.
2. What is the difference between conductors and insulators?
