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Year 1 Electrical BC > D1 > Flashcards

D1 Flashcards

1
Q

Define: Work

A

force x distance

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2
Q

Describe: Charge

A

Symbol used in formula: Q
Electrical Unit: Coulomb
Measured Unit: C

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3
Q

Describe; Power

A

Symbol used in formula: P
Electrical Unit: Watt
Measured Unit: W

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4
Q

Describe: Resistance

A

Symbol used in formula: R
Electrical Unit: Ohm
Measured Unit: Greek letter omega

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5
Q

Describe: emf or PD

A

Symbol used in formula: E
Electrical Unit: Volt
Measured Unit: V

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6
Q

Describe: Current

A

Symbol used in formula: I
Electrical Unit: Ampere
Measured Unit: A

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7
Q

P or pico

A

10^-12

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8
Q

N or nano

A

10^-9

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9
Q

u or micro

A

10^-6

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10
Q

m or milli

A

10^-3

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11
Q

k or kilo

A

10^3

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12
Q

M or mega

A

10^6

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13
Q

G or giga

A

10^9

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14
Q

one horsepower

A

746 watts

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15
Q

formula for motor efficiency

A

output watts/input watts x 100 = efficiency %

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16
Q

Energy =

A

power x time

Unit: Kw h

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17
Q

Define: Matter

A

anything that occupies spaces or has mass

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18
Q

Define: Element

A

contains atoms of only one type

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19
Q

Define: Compound

A

contains atoms of more than one type

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20
Q

Define: Atom

A

smallest unit into which and element can be broken and still possess the properties of that element

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21
Q

Define: Molecule

A

smallest independent unit which a substance can be broken and still retain the properties of that substance

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22
Q

Atomic number

A

of any element is always equal to the number of protons in its nucleus

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23
Q

valence shell or orbital

A

is the outer orbital of an atom

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24
Q

how many electrons in can a valence orbital hold?

A

8

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25
Q

Stable octet

A

when an atom has eight electrons in the valence shell.

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26
Q

How many valence electrons do conductors have?

A

from 1 to 3

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27
Q

How many valence electrons do insulators have?

A

from 5 to 8

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28
Q

How many electrons do semi-conductors have?

A

exactly four

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29
Q

anion

A

negatively charged atom

30
Q

cation

A

positively charged atom

31
Q

First law of charged bodies states that

A

Like charges repel and unlike charges attract

32
Q

Polarity

A

charge at one point with respect to another

33
Q

List three ways bodies become charged

A

Friction
Conduction
Induction

34
Q

List the useful applications of electrostatic charge

A 
Painting
Sandpaper manufacturing
Smoke precipitator
Air filters
Xerography
35
Q

List two hazards of electric charge

A

Lighting

Spark while refueling a vehicle

36
Q

The direction of electron flow

A

negative to positive in the circuit

positive to negative in the source

37
Q

List the six ways to produce emf

A 
Friction
Chemical
Pressure
Heat
Light
Magnetism
38
Q

Define: triboelectric effect or friction

A

two dissimilar materials are rubbed together, one material can transfer some of its electrons to the other

39
Q

Define: electrochemical effect

A

when a chemical process is used to produce electricity. example: batter

40
Q

Define: piezoelectric effect

A

Mechanical stress of a crystal causing displacement of electrons. example: weigh scale pad

41
Q

Define: thermoelectric effect

A

when a junction of two dissimilar metals is heated. example: thermocouple use to sense temperature

42
Q

Define: photovoltaic effect

A

when photons of light strike the surface of some materials causing the electrons to flow.

43
Q

Define magnetoelectric effect

A

used to produce electricity that is used in homes and business

44
Q

A Coulomb equals

A

6.24 x 10^18 electrons

45
Q

Ohm’s Law

A

E = I X R

46
Q

Watt”s Law 1

A

P = E x I

47
Q

Watt’s Law 2

A

P = I^2R

48
Q

Watt’s Law 3

A

P = E^2/R

49
Q

Ohm’s Law direct proportion

A

if the applied voltage is doubled, the current will also double

50
Q

Ohm’s Law inversely proportional

A

if the resistance is doubled, the current will decrease to half of its previous value.

51
Q

Pictorial diagrams

A

Components are drawn as they appear
Components are in their actual circuit position
Three- dimensional

52
Q

One-line diagrams

A

Components show their name, type, and #
not used to show actual position of components
single lines do not show return path for curcuit

53
Q

Wiring diagram

A

show the actual location of components
components are shown in symbol form
show how it is wired

54
Q

Schematic diagrams

A

shows electrical relationship but no physical

shows how the circuit works not how it looks

55
Q

List three basic parts of a circuit

A

source
load
conductors

56
Q

Define: Short circuit

A

parallel path of low resistance

57
Q

Voltmeters hookup in

A

parallel with the device in which the voltage is to be measured.
have high resistance so no current will flow the meter.

58
Q

Ammeters hook up in

A

series with the circuit

have a low resistance shunt so all the current will flow through the meter

59
Q

List three types of fixed resistors

A

wire-wound
film resistor
carbon-composition

60
Q

In what units is a resistor rated

A

in ohms and watts

61
Q

what is a trip-free breaker

A

it cannot be prevented from tripping by holding the handle in the ON position

62
Q

Define: Ductility

A

ability or a material to be drawn in to a wire

63
Q

Define: Malleability

A

ability of a material to be rolled or hammered into thin sheets

64
Q

Define: Ultimate strength

A

amount of mechanical stress a wire will withstand before breaking

65
Q

Bunch stranded wires are generally used for

A

flexible cords

66
Q

XLPE or X Link

A

Cross-linked or polyethylene

67
Q

Which colour is used for grounding

A

Bare or green

68
Q

Which colour is used for neutral

A

White or natural grey

69
Q

Which colour is can be used for high side or the hot wire

A

Yellow
Blue
Red
Black

70
Q

CEC defines low voltage as

A

31V to 750V

Year 1 Electrical BC (14 decks)

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