HBA Onboarding Bootcamp > Electricity > Flashcards

Electricity Flashcards

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1
Q

What do Volts measure?

A

EMF
Electromotive Force
Potential Difference

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2
Q

What unit is the strength of an electric current measured in?

A

Amphere
Amps

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3
Q

Another term for power?

A

Wattage
Watts

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4
Q

Where should Romex NMD be used?

A

Dry enviroments, with no chance of physical damage.

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5
Q

What must be used with Armoured Cable?

A

Anti-shorts

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6
Q

WHat does EMF stand for in electrical

A

Electromotive force
Is used to indicate electrical pressure or voltage.

“Potential difference”

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7
Q

What does A.C stand for?

A

Alternating Current

A.C is not constant, it’s going from negative to positive in a sine wave

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8
Q

What does R.M.S stand for?

Found on a multimeter.

A

Root Means Square

Modern multimeters calculate the actual Voltage using a formula.

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9
Q

What does Current define in a electrical system?

A

Is a measurement of the rate of flow of electrons.

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10
Q

What is a ampere in an electrical system?

A

An ampere is one coulomb of electrons flowing past a given point in one second.

One coulomb is aprox.
6,280,000,000,000,000,000 or 6.28x10e18 electrons

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11
Q

What is resistance in an electrical circuit?

A

Basically “Oppostion to the flow of electrons”

All material have some resistance to the flow of electrons.

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12
Q

What four things effect resistance in an electrical circuit?

A

Material(Aluminum vs Copper)
Diameter( 8awg vs 6awg)
Length (25’ vs 50’)
Temperature (60Celsuis vs 75 celsuis)

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13
Q

You connect an ammeter in ____ with the load?

Series/Parallel

A

Series

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14
Q

You connect a Voltmeter in____ across the load

Series/Parallel

A

Parallel

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15
Q

In a series circuit, how does resistance act?

A

Total resistance is added together.
(r1+r2+r3=RT)

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16
Q

In a series circuit, how does Amperage behave across each load?

A

The amperage is constant througout a series circuit.
i1=i2=iT

i = Amperage

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17
Q

In a series circuit, how does Voltage behave across each load?

A

The total voltage is equal to all the voltage drops across each load.
ET=E1+E2+E3

E=Voltage

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18
Q

In a parallel circuit, how does Resistance act?

A

Total resistance is less then the lowest sum in the circuit.
{1/(1/R1+1/R2+1/R3)=Rt}**

**Formula for finding resistance in parallel circuit

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19
Q

How does Voltage behave in a parallel circuit?

A

Voltage is constant across each load.
(Et=E1=E2)

Et= voltage total/Total Voltage

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20
Q

In relation to a parallel circuit, how will amperage act?

A

The Current total is all individual loads added together.
(I1+I2=It)

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21
Q

In a series circuit, if one component fails, what happens to the rest of the circuit?

A

The entire circuit stops working

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22
Q

If you add more resistors to a series circuit, the total resistance will:

A

Increase

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23
Q

In a series circuit, if the total voltage is 12V and there are three equal resistors, what is the voltage drop across each resistor?

A

4V

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24
Q

When calculating the total resistance in a series circuit, you should

A

Add them together

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25
In a series circuit, the sum of the individual voltage drops across each resistor is?
Equal to the total voltage
26
If the current through a series circuit is 2A, and the resistance is increased, the current will
Decrease
27
In a series circuit with different resistors, the resistor with the highest resistance will have the_ _ _ _ _ Voltage Drop
Highest
28
In a parallel circuit, if one branch is opened or disconnected, what happens to the other branches?
They will continue to work
29
The electrical service supplied to a building is measured in?
Watts | Watts=Power, Power=Watts
30
Which gauge of wire is normally used for residential lighting and receptacles?
14/2 AWG
31
The GFCI will trip when it senses what change of current flow?
As low as 0.005 Amps
32
What size of grounding/bonding wire is used?
6 AWG
33
The voltage sine wave of a three-phase wire system is out of phase with each other by_ _ _ _ Degrees
120 | 360 Deg. divided in 3 = 120 degrees
34
Failure of a conductor's insulation, causing the conductor to touch casing and create line-to-ground, is called a?
Short Circuit | You SHORT the CIRCUIT by going back to the source.
35
A current surge when a motor starts up is called
An Overcurrent | Motor pulling to many amp very quickly
36
The use of worn out or seized bearings in electrical equipment could cause
Overload | Pulling to many amps for far to long.
37
What is the maximum voltage considered to be a low voltage system? | When compared to power lines!
750V
38
The ability of a material to be drawn into wire form is called:
Ductility
39
When taking a voltage reading, how should the meter be connected?
In parallel with the load being checked.
40
A **basic** multimeter incorporates which electrical meters?
Voltmeter, Ammeter, Ohmmeter
41
What is the power rating of a secondary stage in a transformer if it has 24 volts and 10 amps?
240W P=V*A
42
How many wires are contained in a service conductor to a residential panel? | From the road to the main breaker panel
2 Hot, 1 Neutral, 1 Ground
43
How are transformers rated?
Volt-Amps (VA)
44
The electrical code requires all electrical connections be | Where do you make a wire connection
Made in a junction or outlet box
45
Switches are located in which leg of the circuit?
Hot, You want to interupt power going into the equipment. | Dangerous to do on the Neutral!!!!
46
Thermocouples generate DC voltage in which range?
0-30mV
47
When the pilot fails, the thermocouple must cool down and de-energize the safety shut-off valve or safety switch within:
180 seconds
48
Thermocouples are only approved for gas appliances with inputs up to and including: | How many Btu/H
400,000 Btu/H
49
A thermocouple only generates a voltage if the temperature difference between the hot and cold junctions is at least?
400°F
50
The pilot flame should only heat the first | How much should the flame cover in inches.
1/2"
51
Thermopiles generate a DC voltage of?
600mV-750mV
52
What is one non-desirable characteristic of a normal pilot flame?
A Small, Hard, Sharp flame
53
The thermocouple should be replaced when a open test reading of what occurs?
0-15mV
54
What does A.W.G stand for
American Wire gauge
55
How many volts does a thermostat send to an A/c to power the contactor
24V
56
What unit of measurement are breakers designated?
Amps
57
What does a breaker connect to in a breaker panel box?
Hot Bus Bar
58
What determines the wire gauge and breaker size?
AMPS
59
Which color wire nut would be used for two 14AWG conductors?
Orange
60
Which color wire nut would be used for two 10AWG conductors?
Yellow
61
Which color wire nut would be used for three 14AWG conductors?
Yellow
62
Which color wire nut would be used for two 18AWG conductors?
Blue
63
Which color wire nut would be used for three 18AWG conductors?
Orange
64
How should conductors be terminated into a screw terminal?
The Approved Method
65
How far out of the box shall wires extend?
Minimum of 6"
66
When can junction boxes be uncovered?
NEVER
67
What is the minimum distance for a Natural gas regulator must be from a source of ignition? Propane Regulator?
Natural Gas is 3' Propane is 10'
68
What is Electricity
The Flow of electric charge
69
What are the clearance requirements to a disconnect box from the unit?
3 feet directly in front/adjacent to the unit with an unobstructed path
70
When is mechanical protection required for residential wiring drops?
1.5 meters above the floor
71
What does bonding mean?
Bonding- Bonding is the electrical connection of all exposed metal items not designed to carry electricity in a room or building.
72
An electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit?
Circuit breaker
73
A component with a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current
Fuse
74
Most correct Wire size to run for 15 amps?
14 AWG
75
Most correct wire size to run for 25 amps?
12 AWG
76
Most correct wire size to run for 50 amps?
8 AWG
77
Most correct wire size to run for 30 amps?
10 AWG
78
Most correct wire size to run for 55 amps
6awg
79
Correct size for a bonding wire?
6AWG
80
Maximum distance from a junction box that a wire must be supported? Maximum distance a wire must be supported after?
12"= 1' then 60" = 5' after.
81
Is it against code to use a white neutral to carry voltage?
Only if the wire isn't marked a hot conductor, when you're done with it. | You can take the white wire and mark/tape/paint it black.
82
Can a water heater be on the same circuit as a furnace?
NO, a water heater can be on anothers circuit, BUT a FURNACE must be on a dedicated circuit by itself.
83
Coming from the Breaker Panel, the hot conductors going into a disconnect must be on the...? | Under what screw/lugs?
LINE
84
Using a multimeter how could you test a flame rectification sensor?
Multimeter in SERIES
85
As the temperature of a conductor increases, its resistance..?
Increases
86
True or false - Resistance converts electrical energy to another form of energy.
True, HEAT. LIGHT. MECHANICAL
87
The voltage reading across an open safety circuit would be:
The Applied Voltage 120-208-240 are all APPLIED VOLTAGES | Without knowing the exact value we call it APPLIED VOLTAGE
88
What resistance will a GOOD fuse have?
0 OHMS
89
What resistance will a BAD fuse have?
O/L or infinite
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