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NORA Bronze Test > Basic electrcity > Flashcards

Basic electrcity Flashcards

1
Q

What percentage of service calls are electrical?

A

85%

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2
Q

Who sets the standard for electrical code?

A

National Electrical Code

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3
Q

What is voltage?

A

The force that pushes current through wire.(Potential Energy)

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4
Q

What is amperage?

A

Amount of current flowing through a wire. (Packages)

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5
Q

What are Ohms?

A

Resistance to electrical flow.

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6
Q

What is a Watt?

A

Power Consumed

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7
Q

What are conductors?

A

Material that offers very little resistance to the flow of electricity.

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8
Q

What are insulators?

A

Material that offers a lot of reinsurance to flow. Tightly bound electrons that create an outer valance.

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9
Q

What is a load?

A

Converts electrical energy to some other form of energy to do work.

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10
Q

Loads found on an oil burner?

A

Motors,electromagnetic coils,transformers,heaters.

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11
Q

Parts of a circuit?

A

Source,switch, load,conductor

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12
Q

What is a short circuit?

A

Running a conductor from the source without a load.

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13
Q

What is Ohms law?

A

It takes one bolt to push one amp through one ohm.

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14
Q

What is the Ohms law formela?

A

E

I R

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15
Q

What is the power formela?

A

P

I E

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16
Q

What is a series circuit?

A

There is only one path for electrical current through loads.

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17
Q

What is a parallel circuit?

A

Has separate branches for each load. That way if one circuit goes out it won’t affect the others.

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18
Q

What is D.C.?

A

Direct Current. Comes from battery’s. Only flows in one direction.

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19
Q

What is AC?

A

Alternating Current. Made by generators. Travels both ways.

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20
Q

What is BX?

A

Armored cable with no ground wire.

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21
Q

What is MC?

A

Armored Cable with green insulated ground wire.

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22
Q

What is greenfield?

A

Armored cable with no wires in it.

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23
Q

What is a switch for?

A

To stop the flow of electricity.

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24
Q

For a switch to safely control a load on a oilheat system it must be located in the ,never in the .

A

L1, Nuetral

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25
Q

What is SPST?

A

Single Pole Single Throw.

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26
Q

What is DPST?

A

Double Pole Single Throw. Can make or break two deprecate circuits agh the same time.

27
Q

What is a relay?

A

When a switch is sense to be normally open or normally closed.

28
Q

What is bimetal?

A

Two different strips of metal fused together. One end is secured the other under a electric heater. As it heats the two metals expand at different speeds.

29
Q

What is a solenoid?

A

A coil which creates a magnetic field.

30
Q

What measures voltage?

A

Voltmeter which measures the difference in electric pressure between two points.

31
Q

What does an ammeter measure?

A

Amps

32
Q

What should you know when measuring with you ammeter?

A
  • Type of circuit
  • Design ampacity
  • Design current draw of the loads.
33
Q

Where can you find the design current draw of a load?

A

Eating Plate.tells you the design current draw in Amps for steady normal state operation.

34
Q

What is used to measure resistance?

A

Ohmmeter. Measures resistance between two points.

35
Q

How do you use an ohmmeter?

A

Shut of power due to ohmmeter has is own battery. Apply’s a steady voltage from the meters battery to test resistance.

36
Q

What is continuity?

A

A measurement of a complete circuit.

37
Q

What are some common causes of overloads?

A
  • To many devices on circuit
  • devices working to hard
  • damaged devices
  • surge when motor starts
38
Q

What are fuses?

A

One time safety devices. Protect against to much current.

39
Q

What’s is electricity?

A

Movement of electrons from molecule to molecule of a conductive material.

40
Q

What are the parts of a circuit?

A

Source,switches,conductors,load

41
Q

How is wore sized?

A

(AWG) American Wire Gusge

42
Q

What size is thermostat wire?

A

18 Gauge

Good for 5 Amps

43
Q

Sizes of wire and amp rating?

A 
16/extension chords/10A
14/Romex/ 15A
12/Appliances/20A
10/pumps/30A
8/dryers/40A
44
Q

What are the styles of wire?

A
  • solid
  • stranded
  • cable
  • Romex
45
Q

Different types of Romex?

A
  • white 14 gauge
  • yellow 12 gauge
  • orange 10 gauge
46
Q

Styles of copper tubing?

A

Soft Drawn

Hard drawn

47
Q

Soft drawn tubing?

A
  • Comes in 50/100FT Rolls

- Measured by outside diameter

48
Q

Hard drawn tubing?

A
  • Comes in 10/20FT
  • measured by inside diameter
  • ACR measured outside diameter.
49
Q

Types of copper tubing?

A

M,L,K

50
Q

M copper tubing?

A
  • Red
  • Thinnest
  • Non potable water, mechanical systems
51
Q

L copper tubing?

A
  • Blue
  • Medium Thickness
  • Potable Water, AC/R
52
Q

K copper tubing?

A
  • Green
  • Thickest wall
  • Direct bury,potable water,Gas
53
Q

What is soldering?

A

Process using heat and alloy to join copper together.

54
Q

At what temperature does soldering occur?

A

850 Degrees

55
Q

What is soft solder made of?

A

95 % Tin

5 % Antimonium

56
Q

What does DVOM stand for?

A

Digital Volt Ohm Meter

57
Q

V- - - -

______ ?

A

Volts DC ( Battery’s)

58
Q

What is a capacitor?

A

Electrical storage device

59
Q

Types of capacitors?

A

Start & Run

60
Q

What is a start capacitor used for?

A

Start motors, stronger

61
Q

What is a run capacitor used for?

A

Gives extra ump

62
Q

What is a microfarad?

A

Electrical boost, how a capacitor is measured.

63
Q

How do you know if a capacitor is good?

A

If microfarads go up then down and reverse on it’s own.

64
Q

How do you know if a capacitor is bad?

A

If it reads zero Ohms or overload.

NORA Bronze Test (11 decks)

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