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Module 4, Lesson 3 > ITEC 220 Test #1 > Flashcards

ITEC 220 Test #1 Flashcards

1
Q

Short circuit

A

An unintended path for current to flow which bypasses the intended devices

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2
Q

A three-wire line cord has one connector tied to chassis ground

A

True

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3
Q

Fuse

A

A protection device which overcurrent produces heat to melt a fusible element

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4
Q

Circuit breaker

A

A circuit interruption device that activates when an overcurrent is applied

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5
Q

Thermal overload

A

A protection device that opens when the ambient temperature rises above the rated value

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6
Q

Electromechanical relay

A

A switch that is activated by electromagnetism

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7
Q

If a fuse blows, replace it with a higher valued one

A

False

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8
Q

A fuse is what type of indicator

A

Circuit overload

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9
Q

An interlock or third-wire ground plug is an example of

A

Prevention protection

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10
Q

Schematic symbol

A

Drawings that represent components

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11
Q

Transducer

A

A device that changes one from of energy into another form

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12
Q

Atom

A

The smallest particle of an element

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13
Q

Proton

A

A heavy positive particle in the nucleus of an atom

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14
Q

Electron

A

A light negative particle orbiting the nucleus of an atom

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15
Q

Nucleus

A

The center of an atom. It consists of protons and neutrons

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16
Q

Neutron

A

A heavy particle, having no charge, found in the nucleus of an atom

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17
Q

Charge

A

The attraction and repulsion between particles

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18
Q

Element

A

A material that cannot be broken down by chemical reaction

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19
Q

Molecule

A

The smallest unit of a compound that has the same characteristics as the compound

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20
Q

Compound

A

A material whose molecules are the same

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21
Q

Shells/rings

A

The layers in which the electrons are found

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22
Q

The smallest particles into which an atom can be divided are called

A

Protons and electrons

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23
Q

An electron has a negative charge

A

True

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24
Q

Unlike charges repel each other

A

False

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25
Q

What is formed when two or more atoms of different elements are combined

A

A molecule

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26
Q

Valence electrons

A

The outermost electrons of an atom

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27
Q

Free electrons

A

Valence electrons that can move easily from atom to atom

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28
Q

Insulators

A

Compounds in which the bonding of the atoms prevent the valence electrons from becoming free electrons

29
Q

Dielectrics

A

Insulators that help electrodes store charge

30
Q

Conductor

A

Material whose atoms on the outer ring are less than half complete

31
Q

Semiconductor

A

Element whose outer ring is half of electrons is exactly half complete

32
Q

Resistance

A

The opposition to the movement of electrons in a conductive material

33
Q

Ohm

A

The unit of electrical resistance (a current of 1 amp will flow when there is a potential difference of 1 volt across it.)

34
Q

Mil

A

One-thousandth of an inch

35
Q

Circular mils

A

Equal the square of the diameter expressed in mils

36
Q

How many electrons are in the outer ring of atoms of semiconductor material

A

4 electrons

37
Q

A conductor has (few,many) free electrons

A

Few

38
Q

Static electricity

A

Refers to the electrical charge generated by friction

39
Q

Coulomb

A

A unit of charge equal to the charge produced by 6.24 x 10 to the eighteenth

40
Q

Potential difference

A

Difference between points A and B is the potential of B subtracted by A.

41
Q

Volt

A

A unit of potential difference (can move 1 coulomb of charge while producing 1 unit of electrical work)

42
Q

Joule

A

The unit of work energy

43
Q

Electromotive force

A

The potential difference between the terminals of a device which can be a source of electrical energy

44
Q

Current

A

The movement of electrical charge

45
Q

Ampere

A

The unit of current

46
Q

Conductance

A

The ability of a circuit to move electrical charges

47
Q

Watt

A

The expenditure of one joule of energy in one second of time

48
Q

What is the basic unit used to describe a difference of potential

A

Volt

49
Q

Current defines a quantity of flow of electrons

A

True

50
Q

Electrode

A

Electrical conductor by which current enters or leaves a medium such as an electrolyte.

51
Q

Electrolyte

A

Any solution that conducts electric current

52
Q

Anode

A

The negative terminal of a primary cell. The terminal where oxidation takes place

53
Q

Cathode

A

The positive terminal of a primary cell

54
Q

Battery

A

A voltage source which is usually a combination of electrochemical cells

55
Q

Wet cell

A

Cell that has liquid electrolytes

56
Q

Dry cell

A

Cell having the electrolyte in the form of a moist paste

57
Q

Primary cell

A

A cell that converts chemical energy to electrical energy by an irreversible chemical reaction

58
Q

Secondary cell

A

A cell that converts chemical energy into electrical energy, but the cell can be recharged

59
Q

Five methods of generating voltage

A

Mechanical, chemical, static, thermal, and light

60
Q

Why is a voltaic cell impractical to use

A

Because the charges have reached a state of equilibrium

61
Q

What method of generating electricity is most widely used for home lighting and appliances

A

Mechanical

62
Q

Piezoelectric effect

A

An effect in which electric polarization is produced by mechanical pressure

63
Q

Thermocouple

A

A device consisting of two metals, one whose junction is kept at a fixed temp

64
Q

What determines the amount of voltage generated by a solar cell

A

The intensity of the sun

65
Q

What could a solar cell be used for

A

Satellites

66
Q

What determines the amount of current generated by a thermocouple

A

Intensity of the heat applied

67
Q

Possible applications of a thermocouple

A

Temperature control and monitoring inudstrial processes

68
Q

What is piezoelectricity

A

Mechanical pressure of crystals that create an electrical charge

69
Q

Resistor

A

Components designed to have specific numbers of ohms of resistance

Module 4, Lesson 3 (18 decks)

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