Introduction to Electrical Theory

Question 1

What are the three parts of an atom?

Answer 1

Proton. Neutron. Electron.

Question 2

What is a valence shell?

Answer 2

The outermost ring of electrons in an atom.

Question 3

A proton has what charge?

Answer 3

Positive

Question 4

A neutron has what change?

Answer 4

None

Question 5

An electron has what charge?

Answer 5

Negative

Question 6

What is an ion?

Answer 6

An atom that gains or loses an electron

Question 7

What is a conductor?

Answer 7

A material through which it is relatively easy to maintain an electric current.

Question 8

What is an insulator?

Answer 8

A material through which it is difficult to conduct an electric current.

Question 9

What is a semiconductor?

Answer 9

A material that has electrical properties between that of a conductor and an insulator.

Question 10

How many valence electrons does a conductor have?

Answer 10

Three or fewer

Question 11

How many valence electrons does a semiconductor have?

Answer 11

Four

Question 12

How many valence electrons does an insulator have?

Answer 12

Five or more

Question 13

What are some examples of conductors?

Answer 13

Copper and aluminum

Question 14

What are some examples of semiconductors?

Answer 14

Germanium and silicon

Question 15

What are some examples of insulators?

Answer 15

Porcelain and plastic

Question 16

Define voltage

Answer 16

The driving force that makes current flow

Question 17

What symbol is used for voltage?

Answer 17

E

Question 18

Define current

Answer 18

The movement, or flow, of electrons in a circuit.

Question 19

What is the symbol for current?

Answer 19

I

Question 20

What is current measured in?

Answer 20

Amperes (Amps)

Question 21

Define resistance

Answer 21

An electrical property that opposes the flow of current through a circuit.

Question 22

What is the symbol for resistance?

Answer 22

R

Question 23

What is resistance measured in?

Answer 23

Ohms (Ω)

Question 24

Define power

Answer 24

The rate of doing work, or the rate at which energy is used or dissipated.

Question 25

What is electrical power measured in?

Answer 25

Watts

Question 26

Define coulomb (C)

Answer 26

A unit of electrical charge equal to 6.24 x 10^18 (6,240,000,000,000,000,000) electrons

Question 27

Define joule (J)

Answer 27

A unit of energy measurement for doing work. One joule is equal to one newton-meter (Nm)

Question 28

What is conventional current theory?

Answer 28

The electrical theory that electrons flow from positive to negative

Question 29

What is electron flow theory?

Answer 29

The electrical theory that electrons flow from negative to positive

Question 30

What factors affect current?

Answer 30

Applied voltage. Wire size. Conductor material. Temperature. Conductor length.

Question 31

How does conductor length affect resistance?

Answer 31

As the wire length increases, the resistance also increases

Question 32

How does wire size affect resistance?

Answer 32

The resistance goes down as the wire size goes up

Question 33

What is ohms law?

Answer 33

Current = Voltage / Resistance (I = E / R)

Question 34

What is the power equation?

Answer 34

Power = Current * Amperes (P = E * I)

Question 35

How many watts in a horsepower?

Answer 35

746

Question 36

Define kilo

Answer 36

1,000

Question 37

Define mega

Answer 37

1,000,000

Question 38

Define watt

Answer 38

The basic measurement of electrical power. One watt equals one ampere of current flowing through a potential difference of one volt.

Question 39

What are the six methods for producing electricity?

Answer 39

Magnetism. Chemical action. Pressure. Heat. Friction. Light.

Question 40

What is the most common method of producing electricity?

Answer 40

Magnetism

Question 41

What is the second most common method of producing electricity?

Answer 41

Chemical action

Question 42

What are the five basic effects that can be caused by electricity?

Answer 42

Magnetism. Chemical reactions. Light. Heat. Pressure.

Question 43

Define photon

Answer 43

A massless particle of pure energy

Question 44

How are photons produced?

Answer 44

When electrons move from one energy level to another.