Electricity > SOC Homework Electricity > Flashcards

SOC Homework Electricity Flashcards

(68 cards)

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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
what is R
R= OHMS or R = resistance
26
what is I
I= amperes or A = amperes
27
what amperage do main panel boxes come in
100, 150 and 200 amp
28
give examples of DC and AC electricity
DC: batteries, static and lightning AC: generators, its a frequency measured in cycles per sec, or most commonly known as hertz
29
how many hertz do circuits in the USA use
60 hrtz
30
what is ohms law
defines the relationships between power, voltage, current and resistance
31
what is voltage
voltage is the potential to do work i.e. 120/240 v
32
what are amps
when electricity is put to work at the outlet
33
what is the "West Virginia Formula"
watts = volts x amps volts = watts/amps amps = watts/volts
34
what is grounding
removing excess electricity in the system
35
what is the min length for a grounding rod
8'
36
what is the min diameter of a grounding rod
1/2"
37
what is bonding
joining metal or conductive parts to form an electrically conductive path
38
what needs bonding
anything that can be a conductor i.e. metal
39
what must be done when adding a new sub-panel
seperate the grounding bar and the neutral bar in the new sub panel box
40
what is an arc fault interrupter
detects fault caused by fire and trips breaker for the circuit
41
what are some load sources
* panel box * end of circuit receptacle * switch loop * junction box
42
what are some uses for a 20 amp circuit
small appliances and lighting
43
what are some uses of a 30 amp circuit
dryers, cook tops
44
what are some uses of 40-50 amp circuits
water heaters
45
what are some uses of over 50 amp circuits
electric furnaces, air conditioning equipment
46
what is the 80% rule
never go more than 80% amps for the circuit
47
when installing branch circuits you must know what
* 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
for planning use, how many watts do you use per square foot
3 watts
49
what are green/copper wires
grounding
50
what are black/red wires
hot wires
51
what are white wires
neutral
52
what must you do with a neutral wire you made hot
mark it with black or red tape
53
how high should receptacle boxes be mounted
12"
54
how high should washer/dryer receptacles be
36"
55
how high should receptacles over counters be
42"
56
how high should switch boxes be
48"
57
how many inches min should wires protrude from boxes/receptacles
8"
58
what is the max amount of sheathing to be removed from wires
3/4"
59
what is a GFCI
Ground Fault Circuit Interrupter
60
when installing a three way switch for a light what wire must you run between switches
12/3 wire 12 gauge/2 hots 1 nuetral
61
if you want to install a 4 way switch with 3 way switches what must you do
have the 3 way switches at the ends
62
what gauge wire do you use for 15 amp circuits
15 gauge
63
what gauge wire do you use for a 20 amp circuit
12 gauge
64
what gauge wire do you use for a 30 amp circuit
10 gauge
65
what gauge wire for 40 amp circuit
8 gauge
66
what gauge wire for 50 amp circuit
6 gauge
67
how do you convert HP to amps
HP= (V x A x EFF)/750
68
how many watts is 1 HP
750 watts
Electricity
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