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Electricity > SOC Homework Electricity > Flashcards

SOC Homework Electricity Flashcards

1
Q

What are some Conductors

A
  • Metal
  • surface and sub-surface of earth
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2
Q

what are some Insulaters

A
  • Glass
  • plastic
  • rubber
  • dry wood
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3
Q

what do insulators do

A

slow or stop the flow of electricity

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4
Q

what happens when exposed to 1 miliampere of electricity

A

faint tingle

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5
Q

what happens when exposed to 5 miliampere of electricity

A

slight shock felt. average person can let go

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6
Q

what happens when exposed to 6-25 miliampere of electricity

A

(women) painful shock, loss of muscle control

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7
Q

what happens when exposed to 9-30 miliampere of electricity

A

(men) the freezing current or “let go “ range. cannot let go, but can be thrown away from the circuit if extensor muscles are stimulated

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8
Q

what happens when exposed to 50-150 miliampere of electricity

A

extreme pain, respiratory arrest, severe muscle contractions. death is possible

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9
Q

what happens when exposed to 1,000-4,300 miliampere of electricity

A

rythmic pumping action of the heart ceases.

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10
Q

what kind of burns can an electrical accident cause, and whats the most serious

A

electrical burn, arc burn, thermal contact burn or combination of all

electrical burn is the most serious

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11
Q

what color are ungrounded conductors, or “hot wires” generally

A

black or red, but may be any color other than green or white or gray

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12
Q

what is grounding

A

intentionally creating a low distance path connects to the earth.

normally a secondary protective measure

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13
Q

what are circuit protection devices

A

they automatically limit or stop the flow of electricity in the event of a ground fault, overload, or short circuit in the wiring system

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14
Q

what are some examples of circuit protection devices

A
  • fuses
  • circuit breakers
  • ground fault circuit interrupters
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15
Q

what is HP

A

HP=Horsepower

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16
Q

what is KW

A

KW=kilowatts

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17
Q

what is PF

A

PF=powerfactor

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18
Q

what is kwh

A

kwh=kilowatt hour

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19
Q

what is VA

A

VA=volt-amperes

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20
Q

what is KVA

A

KVA=kilovolt-amperes

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21
Q

what is C

A

C=capacitance

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22
Q

what is EFF

A

EFF=efficiency (expressed as a decimal)

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23
Q

what is E

A

E=Volts or V = volts

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24
Q

what is P

A

P= watts or W = watts

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25
Q

what is R

A

R= OHMS or R = resistance

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26
Q

what is I

A

I= amperes or A = amperes

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27
Q

what amperage do main panel boxes come in

A

100, 150 and 200 amp

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28
Q

give examples of DC and AC electricity

A

DC: batteries, static and lightning

AC: generators, its a frequency measured in cycles per sec, or most commonly known as hertz

29
Q

how many hertz do circuits in the USA use

A

60 hrtz

30
Q

what is ohms law

A

defines the relationships between power, voltage, current and resistance

31
Q

what is voltage

A

voltage is the potential to do work i.e. 120/240 v

32
Q

what are amps

A

when electricity is put to work at the outlet

33
Q

what is the “West Virginia Formula”

A

watts = volts x amps

volts = watts/amps

amps = watts/volts

34
Q

what is grounding

A

removing excess electricity in the system

35
Q

what is the min length for a grounding rod

A

8’

36
Q

what is the min diameter of a grounding rod

A

1/2”

37
Q

what is bonding

A

joining metal or conductive parts to form an electrically conductive path

38
Q

what needs bonding

A

anything that can be a conductor i.e. metal

39
Q

what must be done when adding a new sub-panel

A

seperate the grounding bar and the neutral bar in the new sub panel box

40
Q

what is an arc fault interrupter

A

detects fault caused by fire and trips breaker for the circuit

41
Q

what are some load sources

A
  • panel box
  • end of circuit receptacle
  • switch loop
  • junction box
42
Q

what are some uses for a 20 amp circuit

A

small appliances and lighting

43
Q

what are some uses of a 30 amp circuit

A

dryers, cook tops

44
Q

what are some uses of 40-50 amp circuits

A

water heaters

45
Q

what are some uses of over 50 amp circuits

A

electric furnaces, air conditioning equipment

46
Q

what is the 80% rule

A

never go more than 80% amps for the circuit

47
Q

when installing branch circuits you must know what

A
  • the watts of each load
  • the amps required by each load
  • the voltage required by the load
  • the distance from the service panel to the load
48
Q

for planning use, how many watts do you use per square foot

A

3 watts

49
Q

what are green/copper wires

A

grounding

50
Q

what are black/red wires

A

hot wires

51
Q

what are white wires

A

neutral

52
Q

what must you do with a neutral wire you made hot

A

mark it with black or red tape

53
Q

how high should receptacle boxes be mounted

A

12”

54
Q

how high should washer/dryer receptacles be

A

36”

55
Q

how high should receptacles over counters be

A

42”

56
Q

how high should switch boxes be

A

48”

57
Q

how many inches min should wires protrude from boxes/receptacles

A

8”

58
Q

what is the max amount of sheathing to be removed from wires

A

3/4”

59
Q

what is a GFCI

A

Ground Fault Circuit Interrupter

60
Q

when installing a three way switch for a light what wire must you run between switches

A

12/3 wire

12 gauge/2 hots 1 nuetral

61
Q

if you want to install a 4 way switch with 3 way switches what must you do

A

have the 3 way switches at the ends

62
Q

what gauge wire do you use for 15 amp circuits

A

15 gauge

63
Q

what gauge wire do you use for a 20 amp circuit

A

12 gauge

64
Q

what gauge wire do you use for a 30 amp circuit

A

10 gauge

65
Q

what gauge wire for 40 amp circuit

A

8 gauge

66
Q

what gauge wire for 50 amp circuit

A

6 gauge

67
Q

how do you convert HP to amps

A

HP= (V x A x EFF)/750

68
Q

how many watts is 1 HP

A

750 watts

Electricity (1 decks)

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