Download CHAPTER 2 ELEC REVIEW KEY

ELPT 1311 – Basic Electrical Theory
Chapter 02, Basic Electrical Concepts
KEY___________________________
Name _______
1
Matter that cannot be broken down into two or more simpler substances is
referred to as __________.
ANS: The best answer/response to the above question/statement is:
a) solid
b) model
c) element
d) property
e) x
f) x
page ___
2
The electron has a(n) __________ charge.
ANS: The best answer/response to the above question/statement is:
a) positive
b) negative
c) neutral
d) opposite
e) x
f) x
page ___
3
The atomic number of an atom tells you how many __________ it has.
ANS: The best answer/response to the above question/statement is:
a) protons
b) neutrons
c) electrons
d) shells
e) both a) and b)
f) both a) and c)
page ___
4
In its neutral state, an atom has __________.
ANS: The best answer/response to the above question/statement is:
a) a negative charge
b) an equal number of electrons and protons
c) an equal number of neutrons and protons
d) a positive charge
e) x
f) x
page ___
1
5
A proton has a(n) __________ charge
ANS: The best answer/response to the above question/statement is:
a) positive
b) negative
c) neutral
d) opposite
e) x
f) x
page ___
6
Electrons orbit the nucleus of an atom __________.
ANS: The best answer/response to the above question/statement is:
a) at Bohr levels
b) in shells
c) in valances
d) in negative paths
e) x
f) x
page ___
7
The maximum number of electrons that can be found in the second orbital path
closest to the nucleus is __________.
ANS: The best answer/response to the above question/statement is:
a) 9
b) 8
c) 6
d) 12
e) x
f) x
page ___
8
If the outermost orbital path in an atom has six electrons, it is __________.
ANS: The best answer/response to the above question/statement is:
a) a positive ion
b) a negative ion
c) incomplete
d) complete
e) x
f) x
page ___
9
10
The orbital path containing one or more electrons that is furthest from the
nucleus is called the __________ shell.
ANS: The best answer/response to the above question/statement is:
a) valence
b) ionic
c) negative
d) positive
e) x
A positive charge and a negative charge always __________.
2
ANS: The best answer/response to the above question/statement is:
a) repel each other
b) add to each other
c) attract each other
d) combine to form a neutral charge
e) x
f) x
page ___
11
An outside force causes an atom to lose one electron. This produces a(n)
__________.
ANS: The best answer/response to the above question/statement is:
a) a positive ion
b) a positive charge on an atom
c) a free electron
d) all of the above
e) x
f) x
page ___
12
If a free electron drifts in the vicinity of a positive ion, it __________.
ANS: The best answer/response to the above question/statement is:
a) neutralizes the ion
b) is repelled by the ion
c) produces a negative ion
d) causes all of the above
e) x
f) x
page ___
13
At room temperature, the motion of free electrons in a material with no external
force is __________.
ANS: The best answer/response to the above question/statement is:
a) always from positive to negative
b) always from negative to positive
c) faster than at high temperature
d) random
e) x
f) x
page ___
14
The symbol used for current in a formula is __________.
ANS: The best answer/response to the above question/statement is:
a) C
b) I
c) A
d) either I or A
15
There are 6.25 x 1018 electrons in one __________
3
ANS: The best answer/response to the above question/statement is:
a) ampere
b) coulomb
c) volt
d) ohm
16
The flow of charge from positive to negative is called __________.
17
ANS: The best answer/response to the above question/statement is:
a) negative current
b) positive current
c) conventional current
d) intensity current
e) x
f) x
page ___
The major classification of currents are__________.
ANS: The best answer/response to the above question/statement is:
a) positive and negative currents
b) direct and indirect currents
c) conventional and alternating current
d) direct and alternating current
e) x
f) x
page ___
18
Whenever current is generated through a component or material, __________ is
produced.
ANS: The best answer/response to the above question/statement is:
a) reactance
b) heat
c) static
d) resistance
e) x
f) x
page ___
19
The force that causes the movement of charge in a material is called _________.
ANS: The best answer/response to the above question/statement is:
a) voltage
b) electrical force
c) electromotive force
d) all of the above
e) x
f) x
page ___
4
20
The volt is defined by the amount of __________ it uses to move charge.
ANS: The best answer/response to the above question/statement is:
a) energy
b) work
c) current
d) force
21
The ohm, the unit of electrical resistance, is represented by the Greek letter
__________.
ANS: The best answer/response to the above question/statement is:
a) alpha,
α
b) phi,
φ
c) omega, Ω
d) beta,
β
22
Insulators typically have __________ valence electrons.
ANS: The best answer/response to the above question/statement is:
a) 2
b) 4
c) 8
d) 6
23
Conductors tend to have __________.
ANS: The best answer/response to the above question/statement is:
a) few valence electrons and many atoms per unit volume
b) many valence electrons and many atoms per unit volume
c) many valence electrons and few atoms per unit volume
d) few valance electrons and few atoms per unit volume
24
The resistance to a material is inversely proportional to __________.
ANS: The best answer/response to the above question/statement is:
a) its length
b) its resistivity
c) its cross-sectional area
d) all of the above
25
As temperature of a conductor increases its resistance __________.
ANS: The best answer/response to the above question/statement is:
a) increases
b) decreases
c) becomes negative
d) becomes positive
5
26
Using the formula and chart below for resistivity, calculate the resistance of a
copper conductor that is has a cross-sectional area of 8625 cmils and is 1200
feet long.
ANS: _____________________________
6