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BU > Alli Terms > Flashcards

Alli Terms Flashcards

0
Q

Greek philosopher who observed that amber attracted small bits of straw after rubbing

A

Thales

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1
Q

reciprocal of impedance

A

admittance

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2
Q

magnetic black rock

A

loadstone

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3
Q

Latin word for amber

A

electrum

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4
Q

he devised the word electricity

A

Sir Thomas Browne

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5
Q

French physicist who formulated the laws on attraction and repulsion between charged bodies

A

charles coloumb

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6
Q

built the first battery called the voltaic pile

A

count alessandro volta

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7
Q

“animal electricity”, first experiments with electric current

A

luigi galvani

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8
Q

danish physicist that moved the needle of a compass with a strong current

A

hans christian oersted

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9
Q

measured the effect of two parallel currents on each other

A

andre’ marie ampere

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10
Q

worked out the law of electrical resistance

A

georg simon ohm

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11
Q

designed the first hydroelectric power statin

A

nikola tesla

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12
Q

developed the incandescent lamp and the central electric light-power station

A

thomas edison

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13
Q

discovered chlorides of carbon and succeeded in liquefying chlorine and other gases

A

michael faraday

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14
Q

discovery of electromagnetic induction and self-induction

A

joseph henry

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15
Q

first to demonstrate the existence of electric waves

A

heinrich hertz

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16
Q

theorized that magnetic fields produced radiant energy

A

james maxwell

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17
Q

designed a dynamo

A

werner von siemens

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18
Q

development of steam engine

A

james watt

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19
Q

focused on the absolute unit of electrical resistance

A

wilhelm edward weber

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20
Q

invented the air brake system to stop trains

A

george westinghouse

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21
Q

electricity that flows through a substance in the form of an electric current

A

dynamic electricity/ electrodynamics

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22
Q

electricity that remains on the surface of a body as a charge

A

static electricity

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23
Q

when a bar of hardened steel is rubbed with a natural magnet

A

artificial magnets

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24
Q

a coil of wire in which a magnetic circuit is completed through a magnetic material

A

electromagnet

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25
Q

iron ores called magnetite

A

natural magnets

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26
Q

soft iron core would with a coil or insulated wire

A

electromagnets

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27
Q

a periodic current, the average value of which over a period is zero

A

alternating current

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28
Q

changes mechanical power to electrical power

A

alternator/ synchronous generator

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29
Q

instrument for measuring electric current

A

ammeter

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30
Q

current that a conductor can carry continuously

A

ampacity

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31
Q

a charge flor of one coulomb per second

A

ampere

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32
Q

current-consuming equipment

A

appliance

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33
Q

branch circuit that supplies energy to one or more outlets

A

appliance branch circuit

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34
Q

synthetic non-flammable insulating liquid used in transformers as insulator

A

askarel

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35
Q

device used to transfer load from one power source to another

A

automatic transfer equipment

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36
Q

houses subbreakers, a sheet metal enclosure for stuff

A

auxiliary gutter

37
Q

device used with fluorescent and high-intensity discharge lamps

A

ballast

38
Q

circuit conductors between the final overcurrent device protecting the circuit and the outlets

A

branch circuit

39
Q

synthetic rubber insulation

A

buna

40
Q

conductor that serves as a common connection for 3 or more circuits in a switchgear assembly

A

bus

41
Q

metallic bar used to provide common contact or termination for a group of wires

A

busbar

42
Q

protective covering applied over a cable

A

cable sheath

43
Q

to open and close a circuit by non-automatic means on a predetermined over-current without damage to tself

A

circuit breaker

44
Q

an arrow having circuit number designating the point at which the branch circuit will be connected

A

circuit homerun

45
Q

unit for measuring the cross-sectinal area of a conductor

A

circular mill

46
Q

measure of permissiveness to charge flow; reciprocal of resistance

A

conductance

47
Q

substance that has free electrons

A

conductor

48
Q

conductor having no covering/insulation

A

bare conductor

49
Q

conductor encased within material of compositino and thickness

A

insulated conductor

50
Q

reciprocal of the resistivity of the substance

A

conductivity

51
Q

structure containing one or more ducts

A

conduit

52
Q

an electrical charge of 6.28 x 10^18 electrons

A

coulomb

53
Q

rate of charge flow

A

current

54
Q

enclosure designed for surface mounting

A

cutout box

55
Q

ratio of the maximum demand of a system

A

demand factor

56
Q

unit of an electrical system that is intended to carry but not utilize electrical energy

A

device

57
Q

energy is divided among feeders; overcurrent devices are usually located here

A

distribution center

58
Q

a conducting path through which electric charges may flow

A

electric circuit

59
Q

converts electrical energy into mechanical energy

A

electric motor

60
Q

comprises of the volt, ampere, ohm…..

A

electrical units

61
Q

transient wave of current, potential, or power in the electric circuit

A

electrical surge

62
Q

physical entity; atomic structure of matter; expenditure of energy

A

electricity

63
Q

process of electromotive force induced by movement of magnetic flux

A

electromagnetic induction

64
Q

energy-charge relation that results in electric pressure that produces charge flow

A

electromotive force (EMF)

65
Q

branch of electrical science dealing with the laws of electricity at rest

A

electrostatics

66
Q

unit of capacitance

A

farad

67
Q

all circuit conductors between the service equipment, the source of a separately derived system, and the final branch circuit overcurrent device

A

feeder

68
Q

disruptive electrical discharge around an insulator

A

flashover

69
Q

instrument for indicating comparatively small currents

A

galvanometer

70
Q

converts mechanical energy into electrical energy

A

generator

71
Q

conducting connection between an electric circuit and the earth

A

ground

72
Q

unit of inductance

A

henry

73
Q

magnetic property of a substance which results from radial magnetism

A

hysteresis

74
Q

opposition to AC current by a combination of resitance and reactance

A

impedance

75
Q

does not allow the flow of electricity through it

A

insulator

76
Q

used to convert dc to ac

A

inverter

77
Q

short length of conductor used to make a connectin between terminals

A

jumper

78
Q

box that joins different runs of cable

A

junction box

79
Q

device for paths for lightning disturbances

A

lightning arrestor

80
Q

unit of conductance; reciprocal of ohm

A

mho

81
Q

unit of resistance

A

ohm

82
Q

law states that current is directly proportional to the applied voltage and inversely proportional to resistance, reactance or impedance

A

ohms law

83
Q

operation of equipment in excess of normal

A

overload

84
Q

produced when 1 unit of work in done in separating unit charges through unit distance

A

potential difference

85
Q

static ac device used to change voltage

A

transformer

86
Q

interruption of contact in devices

A

tripping

87
Q

intended for receptacle outlet or switch plate installation

A

utility box

88
Q

unit of emf

A

volt

89
Q

drop in electric pressure

A

voltage drop

90
Q

unit of electrical power

A

watt

BU (2 decks)

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