VISUAL DICTIONARY XI Flashcards
(145 cards)
1
Q
What is the intrinsic property of matter giving rise to all electric phenomena, occurring in two forms arbitrarily given positive and negative algebraic science and measured in coulumbs?
A
ELECTRIC CHARGE
2
Q
What is the SI unit of electric charge, equal to the quantity of electricity transferred across a conductor by a current of one ampere in one second?
A
COULUMB (C)
3
Q
What is the energy per unit charge available for conversion from a chemical, mechanical, or other form of energy into electrical energy, or vice versa, in a conversion device such as a battery, generator, or motor?
A
ELECTROMOTIVE FORCE
4
Q
What do you call the voltage difference between two points that represents the work involved in the transfer of a unit charge from one point to the other?
A
POTENTIAL DIFFERENCE
5
Q
What is the work required to move a unit charge from a reference point to a designated point?
A
POTENTIAL
6
Q
What is a group of two or more cells to produce electric current?
A
BATTERY
7
Q
What is a device for converting chemical into electric energy usually consisting of a receptacle with electrodes in an electrolyte?
A
CELL
ELECTRIC CELL
GALVANIC CELL
VOLTAIC CELL
8
Q
What is a non-metallic conducting medium in which current is carried by the movement of ions?
A
ELECTROLYTE
9
Q
What is a conductor through which current enters or leaves a non-metallic medium?
A
ELECTRODE
10
Q
What do you call the negative terminal of a primary cell or storage battery?
A
ANODE
11
Q
What do you call the positive terminal of a primary cell or storage battery?
A
CATHODE
12
Q
What is the potential difference or electromotive force expressed in volts, analogous to pressure in water flow?
A
VOLTAGE
13
Q
What is the SI unit of potential difference and electromotive force defined as the difference of electric potential between two points of a conductor carrying a constant current of one ampere and the power dissipated between the points is equal to one watt?
A
VOLT (V)
14
Q
What is the complete path of an electric current including the source of electric energy?
A
CIRCUIT
15
Q
What is an arrangement of components in an electric circuit in which the same current flows through each component in turn without branching?
A
SERIES
16
Q
What is an arrangement of components in an electric circuit in which all positive terminals are connected to one conductor, and all negative terminals are connected to a second conductor, the same voltage being applied to each component?
A
PARALLEL
17
Q
What is the product of potential difference and current in a direct-current circuit?
A
POWER
18
Q
What is the SI unit of power equal to one joule per second or to the power represented by a current of 1 ampere flowing across a potential difference of one volt?
A
WATT (W)
19
Q
What is an amount of power especially the power required to operate an electrical device or appliance expressed in watts?
A
WATTAGE
20
Q
What is a unit of power equal to 1,000 watts?
A
KILOWATT (kW)
21
Q
What is a unit of energy equal to the energy transferred or expended by 1 kilowatt in a 1 hour, a common unit of electric power consumption?
A
KILOWATT-HOUR (kWh)
22
Q
What is the rate of flow of electric charge in a circuit per unit time, measured in amperes?
A
CURRENT
23
Q
What is the basic SI unit of electric current, equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied across a resistance of one ohm?
A
AMPERE (A)
24
Q
What do you call the strength of an electric current measured or expressed in amperes; analogous to the rate of water flow?
A
AMPERAGE
25
what is the opposition of a conductor to the flow of current, causing some of the electric energy to be transformed into heat and usually measured in ohms?
RESISTANCE (R)
26
What is the Sl unit of electric resistance, equal to the resistance of a conduction in which a potential difference of one volt produces a current of one ampere?
OHM (Ω)
27
What law states that for any circuit the electric current (I) is directly proportional to the voltage and inversely proportional to the resistance; I=V/R?
OHM'S LAW
28
what principle states that the rate of production of heat by a direct current is directly proportional to the resistance of the circuit and to the square of the current?
JOULE'S LAW
29
What do you call the resistance per unit length of a substance with a unit cross-sectional area?
RESISTIVITY
SPECIFIC RESISTANCE
30
What do you call the measure of the ability of a substance to conduct electric current, equal to the reciprocal of the resistivity of the substance?
CONDUCTIVITY
SPECIFIC CONDUCTANCE
31
What machine converts mechanical energy into electrical energy?
GENERATOR
32
What is a generator for producing alternating current?
ALTERNATOR
33
What machine converts electric power into mechanical energy?
ELECTRIC MOTOR
34
What is the main current-carrying winding of a motor or generator in which electromotive force is induced?
ARMATURE
35
What do you call the copper or carbon conductor serving to maintain electric contact between fixed and moving elements in a motor or generator?
BRUSH
36
What is an electric current flowing in one direction only and having a magnitude that does not vary or varies only slightly?
DIRECT CURRENT (DC)
37
what is an electric current that reverses direction at regularly recurring intervals, having a magnitude that varies in sinusoidal manner?
ALTERNATING CURRENT (AC)
38
What is a unit of electric measurement, equal to the product of one volt and one ampere, equivalent to one watt for direct-current systems and a unit of apparent power for alternating-current systems?
VOLT-AMPERE (VA)
39
What is a mass of iron or other ferrous material in an electromagnet, induction coil, or transformer, serving to concentrate and intensify the magnetic field resulting from a current in a surrounding coil?
CORE
40
What is a conductor wound in a spiral form to introduce inductance into a circuit?
COIL
41
what is an electric device consisting of two or more windings wound on the same core, which employs the principle of mutual induction to convert variations of alternating current in a primary circuit into variations of voltage and current in a secondary circuit?
TRANSFORMER
42
What is a transformer having fewer turns in the primary winding than in the secondary, serving to transform low voltage to high voltage?
STEP-UP TRANSFORMER
43
What is a transformer having a greater number of turns in the primary winding than in the secondary, serving to transform high voltage to low voltage?
STEP- DOWN TRANSFORMER
44
what do you call the voltage supplied by a power line, measured at the point of use?
LINE VOLTAGE
45
What is any of several conductors extending from a main power line or transformer to the service equipment of a bldg?
SERVICE CONDUCTOR
46
What do you call the supplying of utilities, such as water, gas, and electricity, required or demanded by the public?
SERVICE
47
Referring to being operated on, powered by or transmitting high voltage
HIGH VOLTAGE
48
What is an auxiliary power station where electrical current is converted, as from DC to AC, or where voltage is stepped up or down?
SUBSTATION
49
What is the overhead portion of service conductors extending from the nearest utility pole to a bldg?
SERVICE DROP
50
What is the underground portion of service conductors extending from a main power line or transformer to a bldg?
SERVICE LATERAL
51
What is the decrease in voltage between two points on a power line, usually caused by resistance or leakage along the line?
LINE DROP
52
What is the portion of a service conductor extending from a service drop or service lateral to the service equipment of a bldg?
SERVICE ENTRANCE CONDUCTOR
53
What is a meter for measuring and recording the quantity of electric power consumed with respect to time?
WATT-HOUR-METER
54
What is a fire-rated room housing a transformer and auxiliary equipment for a large bldg, usually located on grade or below around and ventilated directly to the outside air?
TRANSFORMER VAULT
55
What do you call the room containing the service equipment for a bldg ?
SWITCHGEAR ROOM
56
What is the equipment necessary for controlling, metering, and protecting the electric power supply to a bldg, located near the entrance of the service conductors and usually consisting of a main disconnect switch and secondary switches, fuses, and circuit breakers?
SERVICE EQUIPMENT
57
What is a generator for providing emergency power during a power outage?
STANDBY GENERATOR
EMERGENCY GENERATOR
58
What is an emergency system designed to provide power automatically and instantaneously upon failure of the normal power supply?
UNINTERRUPTIBLE POWER SUPPLY
59
What is a group of panels on which are mounted switches, overcurrent devices, metering instruments, and buses for controlling and protecting a number of electric circuits?
SWITCHBOARD
SWITCHGEAR
60
What do you call any of the conductors extending from the service equipment to various distribution points in a bldg?
FEEDER
61
What is a freestanding enclosure housing a disconnect switch, a step-down transformer, and switchgear for a number of electric circuits?
UNIT SUBSTATION
62
What is a fractional part of a period or cycle through which time has advanced, measured from a specified reference point and often expressed as an angle (as in electricity)?
PHASE
63
What do you call a conducting connection between an electric circuit or device and the earth or other point of zero potential?
GROUND
64
Of or pertaining to a circuit energized by an alternating current with one phase or with phases differing by 180°
SINGLE-PHASE
65
Of or pertaining to a circuit energized by two alternating currents or voltages differing in phase by one quarter of a cycle or 90°
TWO-PHASE
66
Of or pertaining to a combination of three circuits energized by alternating currents or voltages differing in phase by one third of a cycle or 120°
THREE-PHASE
67
Referring to being electrically connected to a source of voltage, or electrically charged so as to have a potential different from that of earth
LIVE
HOT
68
Referring to being not electrically connected to a source of voltage
DEAD
69
Referring to being not electrically charged
NEUTRAL
70
What is a local failure in the insulation or continuity of a conductor, or in the functioning of an electrical system?
FAULT
71
what is an abnormal, usually accidental condition of low resistance between two points in an electric circuit, resulting in a flow of excess current?
SHORT CIRCUIT
72
What do you call the main disconnect for the entire electrical system of a bldg, except for any emergency power systems?
SERVICE SWITCH
73
What is a device containing a strip or wire of fusible metal that melts under the heat produced by excess current, thereby interrupting the circuit?
FUSE
74
What is a fuse housing a fusible link in a porcelain alp fitted with a threaded metal base?
PLUG FUSE
75
What is a fuse having a one-time or renewable fusible link enclosed in an insulating fiber tube?
CARTRIDGE FUSE
76
What is a cartridge fuse having a metal blade at each end for making contact with the fusible link within?
KNIFE-BLADE FUSE
77
What is a fuse that delays opening to allow a short-term overload to pass, as when starting a motor?
TIME-DELAY FUSE
78
What is a board on which are mounted the switches, fuses, and circuit breakers for controlling and protecting a number of similar branch circuits, installed in a cabinet and accessible from the front only?
PANELBOARD
79
What is a heavy conductor, usually in the form of a solid copper bar, used for collecting, carrying, and distributing large electric currents?
BUSBAR/BUS
80
What is any conductor of an electrical system intentionally connected to a ground connection?
GROUNDED CONDUCTOR
81
What is a conductor, such as a metal ground rod, ground plate, or cold-water pipe, firmly embedded in the earth to establish a ground connection?
GROUNDING ELECTRODE
82
What is a switch that automatically interrupts an electric circuit to prevent excess current from damaging apparatus in the circuit or from causing a fire?
CIRCUIT BREAKER
83
What is a conductor connecting electric equipment or a circuit to a ground connection?
GROUND WIRE
GROUNDING CONDUCTOR
84
What is a circuit breaker that senses currents caused by ground faults and instantaneously shuts off power before damage or injury can occur?
GROUND-FAULT INTERRUPTER
85
Referring to a momentary, usually accidental, grounding of a conducting wire
GROUND-FAULT
86
What is any of several conducting rods installed at the top of a structure and grounded to divert lightning away from the structure?
LIGHTNING ROD
87
What is a device for protecting electric equipment from damage by lightning or other high-voltage currents, using spark gaps to carry the current to the ground without passing through the device?
LIGHTNING ARRESTER
88
What is the portion of an electrical system extending from the final overcurrent device protecting a circuit to the outlets served by the circuit?
BRANCH CIRCUIT
89
What do you call a branch circuit that supplies current to a number of outlets for lighting and appliances?
GENERAL PURPOSE CIRCUIT
90
What do you call a branch circuit that supplies current to one or more outlets specifically intended for appliances?
APPLIANCE CIRCUIT
91
What is a branch circuit that supplies current only to a single piece of electrical equipment?
INDIVIDUAL CIRCUIT
92
What is a panel for distributing power to other panels or to motors and other heavy power-consuming loads?
DISTRIBUTION PANEL
93
of or pertaining to a circuit in which alternating current below 50 volts is supplied by a step-down transformer from the normal line voltage, used in residential systems to control doorbells, intercoms, heating and Looking systems, and remote lighting fixtures?
LOW-VOLTAGE
94
What is a single insulated conductor or a bound or sheathed combination of conductors insulated from one another?
CABLE
95
What is an electric cable consisting of two or more insulated conductors protected by a flexible, helically wound metal wrapping?
ARMORED CABLE
96
What is an electric cable consisting of a tubular copper sheath containing one or more conductors embedded in a highly compressed, insulating refractory mineral?
MINERAL-INSULATED CABLE
97
What is an electric cable consisting of two or more insulated conductors enclosed in a nonmetallic, moisture-resistant, flame-retardant sheath?
NONMETALLIC SHEATHED CABLE
98
What is a cable for transmitting high-frequency telephone, digital, or television signals, consisting of an insulated conducting tube enclosing an insulated conducting core?
COAXIAL CABLE
99
What is an electric cable enclosed within a metallic sheath in order to reduce the effects of external electric or magnetic fields?
SHIELDED CABLE
100
What is a pliable metallic strand or a twisted or woven assembly of such strands, often insulated with a dielectric material and used as a conductor of electricity?
WIRE
101
What is a substance, body, or device that conducts heat, sound, or electricity?
CONDUCTOR
102
What is a material that is a poor conductor of electricity, used for separating or supporting conductors to prevent the undesired flow of current?
INSULATOR
103
What do you call a nonconducting substance?
DIELECTRIC
104
What do you call the minimum applied voltage at which a given insulator breaks down and permits current to pass?
BREAKDOWN VOLTAGE
105
What do you call the maximum voltage that can be applied to a given material without causing it to break down, usually expressed in volts or kilovolts per unit of thickness?
DIELECTRIC STRENGTH
106
What is an enclosure for housing and protecting electric wires or cables that are joined together in connecting or branch electric circuits?
JUNCTION BOX
107
What is a panel in a casing or box that can readily be removed, as by punching, hammering, or cutting, to provide an opening into the interior?
KNOCKOUT
108
What is a rubber or plastic washer inserted in a hole in a metal part to prevent grounding of a wire passing through the hole?
GROMMET
109
what is an insulating and protective lining for one or more conductors passing through a hole?
BUSHING
110
What is a tube, pipe, or duct for enclosing and protecting electric wires or cable?
CONDUIT
111
What do you call a heavy-walled, tubular steel conduit joined by screwing directly into a threaded hub with locknuts and bushings?
RIGID METAL CONDUIT
112
What do you call a thin-walled, tubular steel conduit joined by compression or set screw couplings?
ELECTRICAL METALLIC TUBING (EMT)
113
what is a flexible, helically wound metal conduit, used for connections to motors or other vibrating equipment?
FLEXIBLE METAL CONDUIT
GREENFIELD CONDUIT
114
What is a channel expressly designed to hold and protect electric wires and cables?
RACEWAY
115
What is a raceway designed for exposed installation in dry, nonhazardous, noncorrosive locations?
SURFACE RACEWAY
116
what is a surface-mounted raceway designed to house the electrical wires for a circuit and a series of receptacles?
MULTI-OUTLET ASSEMBLY
117
what is a raceway suitable for installation under a floor, often used in office bldgs to allow for the flexible placement of power, signal, and telephone outlets?
UNDERFLOOR RACEWAY
118
what is an enclosed raceway for housing conductors or cables?
DUCT
119
What do you call the rigid metal housing for a group of buses insulated from each other and the enclosure?
BUS DUCT
BUSWAY
120
what is an open metal framework for supporting insulated electrical conductors?
CABLE TRAY
121
what is a switch in which the interruption of a circuit occurs in air?
AIR SWITCH
122
what do you call an air switch with a hinged copper blade placed between two contact clips?
KNIFE SWITCH
123
What is a switch controlled by a conductor floating in a liquid?
FLOAT SWITCH
124
what is a quiet switch that opens and closes an electric circuit by shifting a sealed glass tube of mercury so as to uncover or cover the contacts?
MERCURY SWITCH
125
what is a switch operated only by inserting a key?
KEY SWITCH
126
what is a resistor for regulating a current by means of variable resistances?
RHEOSTAT
127
What is a rheostat or similar device for regulating the intensity of an electric light without appreciably affecting spatial distribution?
DIMMER/DIMMER SWITCH
128
what do you call the protective plate surrounding an electric outlet or light switch?
FACEPLATE
129
what is a device for making, breaking, or directing an electric current?
SWITCH
130
what is a switch in which a lever or knob, moving through a small arc, causes the contacts to open or close an electric circuit?
TOGGLE SWITCH
131
What do you call a single-pole, double-throw switch used in conjunction with another to control lights from two locations?
THREE-WAY SWITCH
132
what do you call a switch used in conjunction with two three-way switches to control lights from three locations?
FOUR-WAY SWITCH
133
what is a flexible, insulated conductor for electrically connecting an apparatus to another or to a circuit?
LEAD
134
What is a short, flexible conductor used in connecting a stationery terminal with a terminal having a limited range of motion?
PIGTAIL
135
What is a conductive element or device for establishing an electric connection to an apparatus?
TERMINAL
136
What is a point on a wiring system at which current is taken to supply an electric device or apparatus?
OUTLET
137
What is a junction box designed to facilitate connecting an electric device or receptacle to a wiring system?
OUTLET BOX
138
what is an outlet usually mounted on a wall and housing one or more receptacles for portable lamps or appliances?
CONVENIENCE OUTLET
139
what do you call a female fitting connected to a power supply and equipped to receive a plug?
RECEPTACLE/SOCKET
140
what is a small, flexible, insulated cable fitted with a plug to connect a portable lamp or appliance to a receptacle?
CORD
141
What is a plastic connector containing a threaded metal fitting for screwing onto the intertwined ends of two or more conductors?
WIRE NUT
142
what is any device for joining two or more conductors without a permanent splice?
CONNECTOR
143
what is an outlet having an additional contact for a ground connection?
GROUNDING OUTLET
144
What is a male fitting for making an electrical connection to a circuit by insertion in a receptacle?
PLUG
145
what is a plug having a blade for a ground connection?
GROUNDING PLUG
