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SOC Study Guide > SOC Electricity > Flashcards

SOC Electricity Flashcards

1
Q

hat is purpose of panel box and breakers?

A

Divides an electrical power feed into subsidiary circuits, while providing a protective fuse.

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2
Q
  1. What color is used for neutral wire?
A

White

* if natural wire used as hot wire, recode with electrical tape

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3
Q
  1. What hertz is used outside of United States
A

50 Hz

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4
Q
  1. What is Watts?
A

The amount of energy consumed at a given point. It represented “W”

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5
Q
  1. What are some examples of circuit protection devices?
A

Fuse and Circuit Breakers

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6
Q
  1. What is bonding?
A

The permanent joining of metallic parts to form an electrically conducting path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed

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7
Q
  1. What are some load sources?
A

Panel box, end of circuit receptacle, switch loop, and junction box

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8
Q
  1. How deep grounding must be?
A

Must have 8 feet in ground below the permanent moisture level

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9
Q
  1. What is Amp?
A

The rate of electrical current flow. It represented “A”

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10
Q
  1. How to convert kilowatts to watt?
A

Kilowatt multiply by 1000. 1 kilowatts = 1000 watts

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11
Q
  1. Describe combined Amps
A

a) List all appliances, fixtures and their wattage usage
b) Add total wattage divide by 120/240 volts = Amps
80% rule applies.

• Examples, Total wattage is 1720
1720 /120 volts = 14.333 amps

One 20 amp circuit

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12
Q
  1. What are the five factors influencing the effect of an electric current passing through a human body?
A
  • Frequency (Low is worst)
  • Current frequency
  • Voltage
  • Body contact resistance
  • Internal body resistance
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13
Q
  1. What are the main reasons of Electrical Shock?
A

1) Wear & tear
2) Defective construction
3) Misuse of equipment
4) Insulation failure
• Insulation failure can result when the Hot ungrounded conductor on the appliance comes in contact with the metal frame of the appliance

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14
Q

What are the signs of voltage drop?

A

Dimming lights, and television pictures shrink

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15
Q
  1. What is purpose of nail guard?
A

To prevent nail penetration directly to wire

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16
Q
  1. What are the placement of electrical boxes?
A

48” switch box
42” Receptacle over a counter
36” Washer/Dryer receptacle
12” Receptacle box in living area

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17
Q
  1. List some of electrical Safety
A
  • Wear rubber sole shoe
  • Use Fiberglass or wood ladders near electrical wires
  • Make sure the circuit is disconnected from its power source
  • Use proper circuit testes
  • Treat all electrical circuits as live
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18
Q
  1. What is two types of Electricity?
A

1) DC
Direct current, the electricity flowing in a constant direction.
Ex) Batteries, static and lightning

2) AC
Alternating current, the electricity repeatedly changes its direction.
Ex) generator made, it’s a frequency measured in cycles per second.

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19
Q
  1. Describe West Virginia Formula
A 
Watts = Voltage x Amps
Volts = Watts / Amps
Amps = Watts / Volts
20
Q
  1. What is HP?
A

It is horsepower. One electrical horse power equals 750 watts

21
Q
  1. Describe purpose of each amp circuit
A

20 amp:
Small appliances and lighting
30 amp:
Dryer, cook tops, and shall not exceed 80% of load
40-50 amp:
Cocking equipment electric ranges, water heaters
Over 50 amp:
Electric furnaces, large heat pumps, air-conditioning equipment and larger loads

22
Q
  1. What is Hertz?
A

A hertz is the measurement of electrical frequency, with 1 Hz being one cycle per second

23
Q
  1. What is Volts?
A

Voltage or volt is potential to do operate electric device

V is represent as Voltage (ie 110V )

24
Q
  1. What defines continuous load?
A

Maximum current expected to continue for three hours or more

25
Q
  1. What are the specificity of a grounding rod?
A

Diameter 1/2 inch, must be no less than 8 feet in length

26
Q
  1. What calculation rule could you use for planning ?
A

Use 3 Watts per square foot
• Examples, 2582 sq ft x 3 watts = 7746 watts
7746/120 = 64.55 amps
64.55/20 = 3.22 = 4 circuits

27
Q
  1. What is Ohm’s law?
A 
It defines the relationships between:
(P) Power
(E) Voltage
(I) Current
(R) Resistance
28
Q
  1. What are the three different sizes of main panel box?
A

100, 150, 200 AMPS

29
Q
  1. What is the 2’/4’ rule?
A

In the kitchen, receptacles need to be no more than 4’ apart (for appliance wires are usually 2’ long

30
Q
  1. What do we need to know in order to install circuits?
A

Wattage of each load
Amperes required
Voltage required
The distance from the service panel to the load

31
Q
  1. What color of sheathing is used for 10ga wire?
A

Orange for 30 Amp circuits

32
Q
  1. What tool should you use for removing and replacing fuses?
A

Fuse puller

33
Q
  1. What is the 80% rule?
A

Never go more than 80% amps for the circuit. Continuous load = maximum current expected to continue for three hours or more.

34
Q
  1. What color of sheathing is used for 14ga wire?
A

White for 15 Amp circuits

35
Q
  1. What is insulator and what can be used as insulator?
A

Insulators slow or stop the flow of electricity.

Glass, plastic. Rubber, and anything that consider as non-conductor could be used as insulator

36
Q
  1. What happens when exposed to electricity?
A

Faint tringle, shock, and potential to die.

37
Q
  1. What causes voltage drop?
A
  • Wires too small for load being served
  • A circuit that is too long
  • Poor connection at the terminal
  • Conductors operating at high temperatures
38
Q
  1. What color of sheathing is used for 12ga wire?
A

Yellow for 20 Amp circuits

39
Q
  1. What hertz is used in United States?
A

60 Hz

40
Q
  1. What colors are used for hot wire?
A

Red

Black

41
Q
  1. What is ground Gauge (Copper) Service
A 
#8 to 100A
#6 to 125A
#4 to 165A
#3 to 200A
42
Q
  1. What colors are used for grounding wire?
A

Green / Copper

43
Q
  1. What does transformer do to electric current?
A

Transformer turn a small electric current into a larger one. Also known as Amplifier

44
Q
  1. Before test the circuit, what tester must do?
A

Ensure that circuit is “DEAD”

45
Q
  1. Describe wire gauges
A 
14 gauge = 15 Amps
12 gauge = 20 Amps
10 gauge = 30 Amps
8 gauge = 40 Amps
6 gauge = 50 Amps
46
Q
  1. What is grounding
A

Intentionally creating a low distance path connects to the earth. A secondary protective measure

47
Q
  1. What is the 6’/12’ rule?
A

For every 12’ of wall we need to have a receptacle in the middle

SOC Study Guide (13 decks)

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