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Theory > Unit One > Flashcards

Unit One Flashcards

1
Q

Electricity

A

Flow of electrons

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2
Q

Triboelectric Charging

A

The Process of electron transfer as a result of two objects coming into contact with each other and then separating
(tribe means to rub)

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3
Q

3 things we need for electricity

A
  1. Power source
    2.Closed Circuit Path
    3.Resistance
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4
Q

When does electron flow occur?

A

It occurs when an electron from one atom knocks electrons of another atom out of orbit

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5
Q

What is an at atom?

A

The basic building block of the universe. Its the smallest particle that an element can be broken into

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6
Q

What is all matter made up of?

A

A combination of atoms

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7
Q

What is matter

A

Any substance that has weight and takes up space

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8
Q

What is a molecule?

A

The smallest part of a compound

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9
Q

What are the three principle parts of an atom?

A

1.Protons (+ charge)
2.Neutrons (0 charge)
3.Electrons (- charge)

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10
Q

Where are the protons and neutrons located in an atom?

A

Nucleus

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11
Q

Where are the electrons in an atom?

A

They orbit around the nucleus

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12
Q

What is the valance shell?

A

The outer most electron orbit

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13
Q

What is the most amount of electrons the valance shell of an atom can hold?

A

No more than 8

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14
Q

What is a valance electron?

A

Electrons contained in the valance shell

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15
Q

What does the number of valance electrons determine?

A

Chemical and Electrical properties

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16
Q

What number of valance electrons make good conductors?

A

1,2, or 3

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17
Q

How many valance electrons do silver, copper, and gold have?

A

One

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18
Q

What is the law of charges?

A

Opposite charges attract and like charges repel

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19
Q

Coulombs law of Electrostatic Charge states what?

A

The force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the difference between them

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20
Q

What is the result of an imbalance electrons between objects called?

A

Static Electricity

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21
Q

What are conductors?

A

Materials that allow for easy flow of electrons

22
Q

What conductor is the best?

A

Silver

23
Q

What conductor is the most practical?

A

Copper

24
Q

When do free electrons exist?

A

When current is flowing

25
Q

What are insulators?

A

Materials that resist the flow of electrons

26
Q

How many electrons are typically in an insulators valance shell?

A

7 or 8

27
Q

What does insulation determine?

A

The amount off voltage that can be applied to a conductor and the temperature at which the conductor may be used

28
Q

What is a semiconductor?

A

Materials that do not have characteristics of good conductors or insulators

29
Q

What are conductor sizes measured in?

A

American Wire Gage (AWG) or Circular Mills

30
Q

What is one circular mill equivalent to?

A

0.001

31
Q

What is the equation to calculate resistance of a conductor?

A

R=(k)(l)/(c)(s)(a)

32
Q

What is Voltage?

A

Electrical pressure. A difference in electrical potential between two points

33
Q

Can voltage flow?

A

No, it exists across two points

34
Q

What is voltage drop?

A

The voltage required to force electrons through a value of resistance. If resistance goes up so does voltage

35
Q

What is current?

A

The flow of electrons

36
Q

What meter is current measured with?

A

The ammeter

37
Q

What is the conventional current flow theory?

A

It describes current flowing from (+) to (-)

38
Q

What is the electron flow theory?

A

It describes electron movement from (-) to (+)

39
Q

Voltage pushes current through what?

A

Resistance

40
Q

What are resistors?

A

Electrical components that are designed and constructed to have a specific value of resistance

41
Q

What are resistors used for?

A

To deliberately introduce resistance into a circuit

42
Q

What is a schematic diagram?

A

They are simplified pictorial representations of an electrical circuit

43
Q

How are components represented in schematic diagrams?

A

Simplified Standard Symbols

44
Q

What are schematic diagrams used for?

A

They are used for design, construction, and maintenance of electrical and electronic circuits

45
Q

What are wiring Diagrams?

A

1.They emphasize connections between elements of a circuit or system
2.Use horizontal and vertical lines to represent the wires
3.Use simplified pictorials that clearly resemble circuit/system componets

46
Q

What is a circuit?

A

An unbroken loop of conductive material that allows electrons to flow through continuously from one side of a voltage source to the other

47
Q

What three things must a functional circuit contain?

A
  1. A voltage source
  2. A closed circuit path
  3. A load or resistance in the circuit
48
Q

What is continuity?

A

An electrical connection across two points

49
Q

What is a short circuit?

A

A connection from (-) to (+)

50
Q

What is ground fault?

A

Hot to Ground

51
Q

What is the Mega Ohm Meter (Megger)?

A

It is used to test the integrity of conductor insulation

52
Q

What are multi range meters?

A

They are designed to use one meter movement to measure several ranges of voltage, current, and resistance

Theory (3 decks)

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