Electrician Journeyman Flashcards
Flashcards (148 cards)
1
Q
Term
A
Definition
2
Q
Ampacity
A
The maximum current a conductor can carry continuously without exceeding its temperature rating.
3
Q
Capacitor
A
A component that stores electrical energy in an electric field.
4
Q
Relay
A
An electrically operated switch used to open or close a circuit.
5
Q
Direct Current (DC)
A
Electric current that flows in only one direction.
6
Q
Watt
A
Unit of electrical power equal to one joule per second.
7
Q
Volt
A
Unit of electrical potential difference or pressure.
8
Q
Ampere
A
The unit of electric current, equivalent to one coulomb per second.
9
Q
Circuit
A
A complete path for current to travel from source to load and back.
10
Q
Admittance
A
The ease with which current flows, measured in siemens.
11
Q
Current
A
The flow of electric charge in a conductor.
12
Q
Diode
A
A semiconductor device that allows current to flow in only one direction.
13
Q
Fuse
A
A protective device that melts to break a circuit when current is too high.
14
Q
Frequency
A
The number of AC cycles per second, measured in hertz (Hz).
15
Q
Generator
A
A machine that converts mechanical energy into electrical energy.
16
Q
Hertz
A
Unit of frequency, one cycle per second.
17
Q
Inductance
A
The property of a conductor to resist a change in current, measured in henries.
18
Q
Impedance
A
Total opposition to alternating current, including resistance and reactance.
19
Q
Ohm
A
The unit of electrical resistance.
20
Q
Power
A
The rate at which energy is used or transferred, measured in watts.
21
Q
Resistance
A
The opposition to the flow of electric current, causing heat.
22
Q
Transistor
A
A semiconductor device used to amplify or switch electronic signals.
23
Q
Alternating Current (AC)
A
Current that periodically reverses direction.
24
Q
Ambient Temperature
A
Temperature of the surrounding environment.
25
Ammeter
Instrument for measuring current in a circuit.
26
Box Fill
The number of conductors/devices permitted in an electrical box.
27
Branch Circuit
Circuit from the final overcurrent device to the outlets.
28
Busbar
A conductive bar for distributing electricity inside a panel.
29
Code Violation
An installation that fails to meet NEC requirements.
30
Dead Front
Panel design with no exposed live parts.
31
Demand Factor
Ratio of actual load to maximum possible load.
32
Derating
Reduction of ampacity due to conditions like temperature.
33
Disconnect Switch
A switch used to isolate electrical equipment.
34
Distribution Panel
Main point where electrical power is divided into circuits.
35
Diversity Factor
Used to reduce total load when not all devices run simultaneously.
36
Electrical Load
Total power consumed by a system.
37
EMI
Electromagnetic interference affecting signal transmission.
38
EER
Energy Efficiency Ratio, rating HVAC performance.
39
Farad
The unit of capacitance.
40
Fault Current
Current flowing through an abnormal fault path.
41
Ground Rod
Electrode driven into the earth for grounding.
42
High-Resistance Grounding
Limits fault current using resistors.
43
Inductive Load
Load that causes phase shift due to magnetic field (e.g., motor).
44
kWh
Kilowatt-hour, unit of energy consumption.
45
Lighting Load
The power demand of lighting systems.
46
LOTO
Lockout/Tagout safety procedure.
47
Megger
Device for testing insulation resistance.
48
NFPA
National Fire Protection Association, NEC publisher.
49
Overload Protection
Prevents excessive current in normal operation.
50
Parallel Circuit
Multiple current paths; voltage is the same.
51
Phase
The time difference between multiple AC waveforms.
52
Photovoltaic System
Solar panels converting sunlight to electricity.
53
Plenum
Building space used for air circulation requiring special cables.
54
Power Factor
Ratio of real power to apparent power.
55
Service Entrance
Point where utility power enters a building.
56
Series Circuit
One current path; voltage is divided.
57
Single-Phase Power
AC power with one alternating voltage.
58
Stray Voltage
Unexpected voltage due to grounding or wiring issues.
59
SPD
Surge Protection Device against voltage spikes.
60
Three-Phase Power
AC power system with three voltage waveforms.
61
Transformer
Device that steps voltage up or down.
62
Voltage
Potential difference driving current through a circuit.
63
Wire Nut
Twist-on connector for joining wires.
64
GFCI
Protects against ground faults by cutting off current.
65
NEC
National Electrical Code, standard for electrical safety.
66
Service Panel
Main distribution point for electrical circuits.
67
Romex
Trade name for NM cable used in residential wiring.
68
THHN
Thermoplastic High Heat-resistant Nylon-coated wire.
69
Ground Fault
Unintended electrical path to ground.
70
Breaker Panel
Panel housing multiple circuit breakers.
71
Overcurrent
Excess current exceeding rated value.
72
Conduit
Tube protecting and routing electrical wires.
73
AWG
American Wire Gauge, standard for wire size.
74
Insulator
Material that resists electric current.
75
Conductor
Material allowing current to flow.
76
Short Circuit
Abnormal connection with low resistance.
77
Load Center
Panel for distributing power to branch circuits.
78
Receptacle
Outlet for plugging in electrical devices.
79
Neutral
Returns current to source in AC systems.
80
Hot Wire
Live conductor carrying current from source.
81
Green Wire
Used for equipment grounding.
82
Bonding
Connecting conductive parts to ensure continuity.
83
Knockout
Removable section in boxes/panels for conduit.
84
Box Connector
Secures cable/conduit to a box.
85
Feeder
Conductors supplying power to a panel.
86
Voltage Drop
Loss in voltage over a conductor run.
87
Device Box
Enclosure for switches or outlets.
88
MC Cable
Metal-clad cable used in commercial wiring.
89
UF Cable
Underground Feeder cable.
90
AFCI
Arc Fault Circuit Interrupter.
91
NEMA
National Electrical Manufacturers Association.
92
Wire Gauge
Size rating of electrical wire.
93
Multimeter
Device measuring voltage, current, resistance.
94
Ohmmeter
Measures resistance in ohms.
95
Wattmeter
Measures power consumption in watts.
96
Grounding Electrode
Connection to earth for fault current.
97
Load
Device using electrical energy.
98
Line
Conductors supplying power to load.
99
Circuit Breaker
Device protecting circuit from overcurrent.
100
Disconnect
Manual switch to isolate power.
101
Lug
Connector for terminating conductors.
102
Splice
Joining two conductors.
103
Continuity
Unbroken electrical path.
104
AC Voltage
Voltage that alternates polarity.
105
DC Voltage
Voltage with constant polarity.
106
Clamp Meter
Measures current using a clamp around wire.
107
Step-down Transformer
Lowers voltage from primary to secondary.
108
Step-up Transformer
Increases voltage from primary to secondary.
109
Load Calculation
Determining expected electrical demand.
110
Demand Load
Load used for sizing electrical systems.
111
Main Breaker
Primary overcurrent device in a panel.
112
Neutral Bus
Terminal for connecting all neutral wires.
113
Ground Bus
Terminal for grounding wires.
114
Voltage Rating
Maximum voltage equipment can handle.
115
Amp Rating
Maximum current a device can carry.
116
Receptacle Rating
Current and voltage limits of an outlet.
117
Box Fill Calculation
Number of wires allowed in a box.
118
Tamper-Resistant Receptacle
Outlet with safety shutters.
119
Weatherproof Cover
Protective outlet cover for outdoor use.
120
Backstab
Quick push-in wire connection method.
121
Wire Strip Gauge
Guide for removing insulation.
122
Grommet
Protective ring for cable holes.
123
Raceway
Enclosed conduit for electrical conductors.
124
Flexible Conduit
Bendable conduit for wiring.
125
Liquidtight
Conduit suitable for wet locations.
126
Voltage Tester
Tool to detect presence of voltage.
127
Pigtail
Short wire joining multiple conductors.
128
120/240V System
Common US residential voltage setup.
129
Service Disconnect
Main shutoff for utility power.
130
Load Side
Part of circuit after overcurrent device.
131
Line Side
Part of circuit before overcurrent device.
132
Overhead Service
Power from pole via wires above ground.
133
Underground Service
Power enters property below ground.
134
Voltage Rating of Cable
Max voltage cable can safely carry.
135
Electrical Permit
Authorization for electrical work.
136
Inspector
Verifies code compliance on installations.
137
AHJ
Authority Having Jurisdiction.
138
Annex A
NEC list of product safety standards.
139
Annex B
Guidance for ampacity calculations.
140
Annex C
Conduit and cable fill tables.
141
Annex D
Examples for load calculation.
142
Annex E
Construction types.
143
Annex F
Critical operations power systems.
144
Annex G
SCADA supervisory systems.
145
Annex H
Administration and enforcement.
146
Annex I
Recommended torque values.
147
Annex J
ADA accessibility design.
148
Annex K
Use of medical equipment in dwellings.
