Understanding Electrical Theory Ch. 1

Question 1

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Atoms contain three types of subatomic particles: electrons, protons, and neutrons. The ____ orbit around the nucleus of an atom.

a. electrons
b. protons
c. neutrons
d. nucleus

1.2

Answer 1

a - electrons

Question 2

____ do not participate in the flow of energy and they have a positive electrical charge with lines of force going straight out in all directions.

a. electrons
b. protons
c. neutrons
d. nuclei

1.2

Answer 2

b - protons

Question 3

/// have no charge and therfore have no lines of force.

a. electrons
b. protons
c. neutrons
d. nuclei

1.2

Answer 3

c - neutrons

Question 4

Because of their light weight, ____ actively participate in the transfer of energy and have lines of force going inward in all directions.

a. electrons
b. protons
c. neutrons
d. nuclei

1.2

Answer 4

a - electrons

Question 5

The /// of an atom only contains protols and neutrons.

a. electrons
b. protons
c. neutrons
d. nucleus

1.2

Answer 5

d - nucleus

Question 6

Coulomb’s Law states that, “particles with __________ charges repel each other.”

a. balanced
b. charged
c. unlike
d. like

1.3

Answer 6

d - like

Question 7

Coulomb’s Law states that, “Particles with /// charges attract each other.”

a. balanced
b. charged
c. unlike
d. like

1.3

Answer 7

7 - unlike

Question 8

The atomic charge of an atom is ///________depending on the number of electrons compared to the number of protons.

a. balanced
b. positive
c. negative
d. all of these

1.4

Answer 8

d - all of these - balanced, positive, or negative

Question 9

If an atom contains an equal number of electrons and protons, the atom has a /// atomic charge.

a. balanced
b. positive
c. negative
d. none of these

1.4

Answer 9

a - balanced

Question 10

If an atom contains more electrons than protons, the atom has a /// atomic charge.

a. balanced
b. positive
c. negative
d. none of these

1.4

Answer 10

c - negative

Question 11

If an atom contains more protons than electrons, the atom has a /// atomic charge.

a. balanced
b. positive
c. negative
d. none of these

1.4

Answer 11

b - positive

Question 12

When unlike materials are in contact with each other, electrons from one material move to the surface of the other, but the protons remain on the /// surface.

a. first
b. original
c. last
d. none of these

1.5

Answer 12

b - original

Question 13

When objects are quickly separated, both materials display a charge because one material has an excess of electrons while the other has /// electrons.

a. no
b. fewer
c. more
d. extra

1.5

Answer 13

b - fewer

Question 14

The human body in a low-humidity area may have a dangerous static discharge of several /// volts.

a. hundred
b. thousand
c. million
d. billion

1.5

Answer 14

b - thousand

Question 15

Lightning is the /// of high-voltage cells within clouds to, and from, the Earth and sometimes to space.

a. buildup
b. charging
c. discharging
d. neutralizing

1.6

Answer 15

c - discharging

Question 16

As a cloud’s electrostatic charge builds up, it create an ionized path from the cloud toward the Earth; this ionized path is called a “____.”

a. stepped-down leader
b. streamer
c. ray
d. bolt

1.6

Answer 16

a - stepped-down leader

Question 17

At the same time the stepped leader originates, a similar ionized path called a “____” rises from the Earth or another positively charged object.
a. stepped leader
b. stepped-up streamer
c. ray
d. bolt

1.6

Question 18

An electrostatic discharge (lightning strike) ____ the positive and negative electrostatic charges between the stepped leader and streamer.
a. disrupts
b. interrupts
c. neutralizes
d. equalizes

1.6

Question 19

When lightning strikes a____ object, it will produce a high temperature at the strike point resuliting in cracked concrete or the ignition of combustible materials.
a. conductive
b. nonconductive
c. plastic
d. metal

1.6

Question 20

The lightning protection system intercepts the lightning stirke and provides a safe path for it to ____ the Earth.
a. discharge to
b. neutralize within
c. dissipate to
d. charge particles in

1.7

Question 21

The ____ between the positive charge of the protons and negative charge of electrons keeps them together in the atom.
a. attraction
b. distinction
c. relationship
d. balance

2.2

Question 22

The outermost electron orbital of an atom is called the “valence shell” and electrons in this shell are called “____ electrons.”
a. negative
b. positive
c. valance
d. special

2.3

Question 23

According to Coulomb’s Law, the strength of the electrostatic field between protons and electrons ____ as the distance of the electrons from the nucleus increases.
a. increases
b. decreases
c. equalized
d. strengthens

2.4

Question 24

Energy that is applied to an atom is distributed ____among all the valence elctrons.
a. evenly
b. disproportionally
c. unequally
d. unevenly

2.4

Question 25

Conductance is how easily an object permits the ____of valence electrons from their atom. a. resistance b. water c. movement d. none of these | 2.5

Question 26

Conductive elements are made of one, two, or three valence electrons. Copper and aluminum are the two most common ____ elements used for electrical wiring. a. insulative b. conductive c. expensive d. light weight | 2.5

Question 27

The best conductive elements in order of their conductivity are: ____. a. gold, silver, copper, and aluminum b. gold, copper, silver, and aluminum c. silver, gold, copeer, and aluminum d. silver, copper, gold, and aluminum | 2.5

Question 28

Copper atoms have ____ valence electron(s). When energy is applied to the valence electron(s). When energy is applied to the valence electron(s), the electron(s) can easily be forced to leave the orbit. a. one b. two c. four d. six | 2.5

Question 29

Aluminum atoms have ____valence electrons. When energy is applied to the valence electrons, the energy is distibuted between the electrons. a. two b. three c. four d. eight | 2.5

Question 30

Materials containing six to ____ valence electrons are known as "insulators." a. eight b. ten c. twleve d. fourteen | 2.6

Question 31

Semiconductors contain ____ valance electrons and are often made using carbon, silicon, or germanium. a. one or two b. two or three c. three or four d. four or five | 2.7

Question 32

Atoms strive for chemical stability where the valence shell has ____ valence electrons. a. two b. four c. six d. eight | 2.8

Question 33

Chemical bonding can create a ____ molecule that has different electrical characteristics than the individual atoms themselves. a. special b. compound c. valance d. stable | 2.8

Question 34

An example of ____is rust on metals which can only happen when water, iron, and oxygen are present. a. bonding b. corrosion c. chemistry d. stablility | 2.8

Question 35

When copper is exposed to the environment, the oxygen atoms in the air will chemically bond with the copper atoms on its surface, this creates the compound molecule ____ oxide. a. aluminum b. copper c. silver d. metal | 2.8

Question 36

When aluminum is exposed to the environment, the oxygen atoms in the air will chemically bond with the aluminum atoms, on its surface, this creates the compound molecule ____ oxide. a. aluminum b. copper c. silver d.metal | 2.8

Question 37

In an electrical circuit, the electrons leave the power souce on a (an) ____ path traveling toward a load, and then return to the power source. a. conductive b. insulative c. single d. varying | 3.2

Question 38

The direction of __flow is explained by one of two theories - the "Conventional Current Flow Theory" of the "Electron Current Flow Theory." a. current b. power c. resistance d. voltage | 3.3