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Electrical Grid 1 > week 1 (chapters 1-4) > Flashcards

week 1 (chapters 1-4) Flashcards

1
Q

Voltage can be defined as?

A

electrical pressure or electromotive force.

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2
Q

the amount of insulation needed for a given power line, (size of the insulator) is determined by ?

A

The voltage

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3
Q

The separation between the line conductors is affected by the amount of ?

A

Voltage

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4
Q

safe work practices and the types of tools needed are determined by the amount of ?

A

Voltage

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5
Q

Voltage is always measured between how many points?

A

2

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6
Q

7200/12470
7600/13200
12000/20800
19900/34500
these voltage ranges are common in what type of system?

A

Distribution system

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7
Q

as the _______ increases, so does the conductor separation and the amount of insulation needed.

A

Voltage

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8
Q

voltage measurements are taken from Line to _____ and Line to _______?

A

line-to-neutral and line-to-line

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9
Q

69,000…138,000…. and 500,000 are all examples of _________system voltages because they have only one reading?

A

Transmission

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10
Q

On transmission lines, why is there only one reading given?

A

because transmission lines do not carry a neutral, only line-to-line is taken

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11
Q

when can a distribution system have only one reading (no neutral)

A

when it is underground

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12
Q

Amps measure the ____ of electric current.

A

flow

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13
Q

a quantity of electrons FLOWING past a given point at a given time defines the _______?

A

Amp

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14
Q

a measurement of the amount of electricity FLOWING through a circuit is ?

A

Amperage

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15
Q

How does an amp meter give a reading?

A

by measuring the amount of coulombs per second flowing in a circuit, the meter tells the amperage (number of amps)

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16
Q

if the amperage rating for a wire is exceeded the wire will _____? this is caused by ?

A

Melt, added friction from the colliding electrons

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17
Q

why is amperage important in regards to wires?

A

because wires are rated for a given amount of current flow

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18
Q

define the ohm?

A

the unit of measure for electrical RESISTANCE

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19
Q

the resistance in a circuit is measured in____?

A

Ohms.

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20
Q

when resistance is high in a conductor, greater ______ is created, which results in _____and ______?

A

friction. Heat , Light

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21
Q

it is ______ for a current to flow through a larger diameter wire.

A

easier

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22
Q

one _____ is produced when one amp flows through one volt of potential difference.

A

watt

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23
Q

the watt is a unit of electrical ________?

A

power

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24
Q

The ______ is a unit of electrical POWER?

A

Watt

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25
Q

Volts multiplied by amps will result in?

A

Watts

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26
Q

If you have a 240 volt circuit with 10 amps of current, what is the wattage?

A

2,400……..( 240 x 10 )

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27
Q

What is the formula for calculating watts?

A

Volts x Amps =Watts

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28
Q

how many horsepower is in one watt?

A

746

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29
Q

E = I X R is the mathematical representation for?

A

Ohm’s Law

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30
Q

What does the E stand for in Ohm’s law?

A

Electromotive force (voltage)

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31
Q

What does the I stand for in Ohm’s law?

A

Intensity of current (amps)

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32
Q

What does the R stand for in Ohm’s law?

A

Resistance (ohms)

33
Q

what three electrical properties are directly proportional to one another and what does this relationship represent?

A

Voltage, amperage, and resistance/ Ohm’s Law

34
Q

E = I X R and Volts = Amps X Ohms,
are synonymous. True or false?

A

True.

35
Q

what is the voltage of an electrical circuit with 5 ohms of resistance and 10 amps of current flow? how is the formula written?

A

E = 10 X 5 ………. E= 50 Volts

36
Q

what is the current flow in a circuit energized with 240 volts and has 6 ohms or resistance? how do you write the formula?

A

I = 240 / 6 ………… 40 amps

37
Q

what is the resistance of a 120 volt circuit with 5 amps of current flow?

A

R = 120 / 5 ……….. 24 ohms

38
Q

what is the voltage of an electrical circuit with 10 ohms of resistance and 15 amps of current flow?

A

150 volts

39
Q

what is the current flow in a circuit energized with 600 volts and has 50 ohms of resistance?

A

12 amps

40
Q

what is the resistance of a 240 volt circuit with 20 amps of

A

12 Ohms.

41
Q

the work performed when voltage and amperage is combined, measured in watts is called?

A

Power

42
Q

Power is proportional to what two electrical properties?

A

voltage and amperage.

43
Q

what is the formula for calculating POWER?

A

P = I X E
Watts = Amps X Volts

44
Q

how many watts of power are being used in a 120 volt circuit drawing 15 amps?

A

1800 watts

45
Q

what is the current flow of a 240 volt circuit that is delivering 3600 watts of power?

A

15 amps

46
Q

what is the voltage of a circuit delivering 14,400 watts of power if the current is 2 amps?

A

7,200 volts

47
Q

what is the voltage of a circuit with a resistance of 8 ohms and 15 amps of current flow?

A

120 volts

48
Q

a circuit delivering 11520 watts of power with a resistance of 20 ohms would have how many volts?

A

480 volts

49
Q

what is the voltage of a circuit delivering 240,000 watts of power with 20 amps of current?

A

12000 volts

50
Q

what is the power delivered in a circuit that has 15 ohms of resistance and 10 amps of current flow?

A

1500 watts

51
Q

the entire electrical system is comprised of four main elements. what are they?

A

Generation, transmission, distribution, substations

52
Q

what are four abnormal conditions of the electrical system for which there are protections in place?

A
  1. excessive current
  2. abnormal voltage
  3. frequency deviations
  4. low power quality
53
Q

what is the voltage produced at GENERATION?

A

13.8 KV (13,800 volts) to 24KV (24,000 volts)

54
Q

the transmission systems are interconnected and called the ____?

A

Grid

55
Q

generating facilities share what common purpose?

A

to generate power as efficiently as possible?

56
Q

the original voltage produced at generation is too ____ and must be stepped _____ just outside for the purpose of long distance transmitting.

A

Low/ Up

57
Q

dispersed micro generation occurs within the ________system?

A

distribution

58
Q

power is transformed, metered, and redirected at a _________ ________?

A

transmission substation

59
Q

how many reliability councils make up the North American Electric Reliability Corporation?

A

8 in the US and one in Canada

60
Q

44 kv, 69kv, 115kv, and 138kv are all common voltages leaving a _______?

A

sub transmission station

61
Q

what are the three primary functions of a sub station?

A

Change voltage from one level to another
connect/dis-connect lines or equipment
adjust voltage and current to control the flow of power

62
Q

what advantage does AC power have over DC?

A

Ac can be transformed, DC cannot

63
Q

voltage stays the same in a parallel circuit. True or false?

A

True. only amperage changes as the load is added or subtracted

64
Q

the coils inside of and electric generator that wind around the magnet are negatively or positively charged?

A

negative

65
Q

the outer ring of an atom having less than 7-8 electrons, identifies that atom as being what? it is called the what?

A

a good conductor/Valence

66
Q

what dictates the size of an insulator?

A

voltage

67
Q

what is the difference between phase-to-neutral and phase-to-ground?

A

nothing, they are the same thing

68
Q

when two phase readings are given on distribution lines, what does the lower number represent? example (7,200/12,470)

A

phase-to-neutral

69
Q

how do you get the second reading of a distribution voltage when only one value is known?

A

multiply the phase-to-neutral by 1.732 or divide the phase-to-phase by it

70
Q

what dictates size of the wire/conductor

A

amperage

71
Q

voltage is ________ if the strength of a magnet and speed at which it passes a conductor are ________?

A

increased/increased

72
Q

what is the square root of 3? why is it important?

A

1.732/ use it to find unknown value in a distribution voltage system.

73
Q

138,000 volts and less are _________ voltages?
230,000 and higher are ___________ voltages?

A

sub transmission/transmission

74
Q

when a wire is built in _______ it increases the amperage rating?

A

strands

75
Q

what is a chain reaction of electrons striking one another/

A

current

76
Q

what is the ohm’s law formula?

A

E=IxR

77
Q

what is the power formula?

A

P=IxE

78
Q

the ______ is equal to that of a conductor in which a current of one amp is produced by a potential of one volt across its terminals?

A

ohm

Electrical Grid 1 (4 decks)

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