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Terms in this set (99)
The rate at which energy is drawn from a source that produces a flow of electricity in a circuit (pressure)
A decrease in voltage along a conductor through which current is flowing?
A flow of electricity through a conductor
An electrical device that resists the flow of electrical current (friction), unit of electric resistance in DC circuits (R)
Total allowable resistance without exceeding the wattage limit.
A device for organizing cable runs in a drop ceiling?
opposition to the flow of electric current resulting from inductance and capacitance (rather than resistance)?
A material's opposition to the flow of electric current, unit of electric resistance in AC circuits (Z)
The property in an electrical circuit where a change in the current flowing through that circuit induces an electromotive force (EMF) that opposes the change in current?
The ability of a conductor to store energy in the form of electrically separated charges?
A unit of potential equal to the potential difference between two points on a conductor carrying a current of 1 ampere when the power dissipated between the two points is 1 watt?
Unit used to measure electric current?
The unit of power, 1 joule per second?
A unit of electrical resistance or impedance that is equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere?
The unit of measurement for electrical energy equal to one kilowatt of power over a one-hour period.
The unit of frequency?
The current in an A/C circuit that does not produce power and is perpendicular to the voltage.
The current that exists within the primary (first) coil of a transformer
A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat or power circuits, designed to be placed in a cabinet or cutout box placed in or against a wall, partition or other support and accessible only from the front.
Fee based on highest rate of energy used during billing period?
The period of time where power usage is measured. Usually related to a sliding window billing policy where demand is averaged within the interval to help determine the overall power usage for the month.
Loads that can be easily turned off and restarted, without serious impact on processes or staff. Include ambient electric heat, hot water heaters, air conditioning, ventilation
Single Phase Service
Refers to the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison. It is used when loads are mostly lighting and heating, with few large electric motors. No revolving magnetic field; single-phase motors need additional circuits for starting, and such motors are uncommon above 10 or 20 kW in rating. Used in rural areas.
Used for measuring the cross section of wires?
AWG (American Wire Gauge)
The standard U.S. wire and cable industry for round cross-section conductors
A circuit in which the objects are connected in a single path?
A closed circuit in which the current divides into two or more paths before recombining to complete the circuit?
Unintended path connecting one part of a circuit with another?
The angle in degrees with which voltage and current differ?
A device that trips like a switch and opens the circuit when overloaded?
An electric current that flows in one direction steadily?
Sheathed cable containing individually insulated electrical wires?
The circuit conductors between the final over current protective device and the outlets?
Element of buildings electrical system that provides electricity to various portions of the builiding and to major equipment?
The commonly used receptacle (outlet). Called "duplex" because it has two plug-in sockets?
Device used to keep water away from the electrical service entrance connection on overhead electrical power.
Where each building connects to the underground city power line.
Ground Fault Protection
Protection against short circuits; a safety device cuts power off as soon it senses any imbalancy between incoming and outgoing current?
Electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit?
Combination of units that are the equivalent to an ohm?
The electrical cables and outlets that hang beside the grid pipes or mounted to the ceiling above the grid to power lighting instrument on the grid?
The number of complete waves that pass a given point in a certain amount of time?
An assembly of copper or aluminum bars in a rigid metallic housing
An electrical conductor that can be attached to a bus to extend it
An electrical raceway mounted to the surface of a floor, wall, or partition.
Single Pole Switch
A switch where there is one break and one pole running through
Two Pole Switch
Contains two poles that are connected to and controlled by one operation.
Three Pole Switch
Labeled "3P"; describes the internal construction of a switch that has three poles and an neutral
Double Throw Switch
Electrical equipment controlling the distribution of electricity?
A switch that uses contact blocks of silver-coated copper, which are forced together to make (close) or separated to break (open) a circuit.
The current in a circuit equals the voltage difference divided by the resistance (V=IR)
A device that increases or decreases the voltage of alternating current.
The current that exists within the secondary coil of a transformer
Uninterrupted Power Supply (UPS)
An arrangement of normal and backup power supplies that transfer a facility's critical load from the normal to the backup in so short of a time that no computer malfunctions
A measure of uniformity of power demand. A low LF indicates a short-time demand peaks for which the user is heavily charged.
A device or action intended to control power (timed energy use). There are two types electric and user. A secondary benefit is the energy savings it produces.
Three Phase Service
A common method of alternating current electric power generation, transmission, and distribution that is common used by grids worldwide to transfer power and to power large motors and other large loads. More economical because it uses less conductor material. Each phase is delayed by 1/3 of a cycle which gives the effect of giving constant power transfer over each cycle of the current and also makes it possible to produce a rotating magnetic field in an electric motor.
Ground Fault Circuit Interrupter
A circuit breaker designed to protect people from electric shock and to protect equipment from damage by interrupting the flow of electricity if a circuit fault occurs?
American Wire Gage
The standard U.S. wire and cable industry for round cross-section conductors
MCM is an abbreviation for thousands of circular mils and is generally used for very large-diameter wire. Most wire uses AWG.
(Electrical Nonmetallic Tubing) A thin-walled corrugated tubing that is moisture-resistant and flame retardant. It is pliable such that it can be bent by hand and is often flexible although the fittings are not. It is not threaded due to its corrugated shape although the fittings might be.
Intermediate Metal Conduit that is a steel tubing heavier than EMT but lighter than RMC that may be threaded.
Short Circuit Protection
The ratio of true power to apparent power
An automatic means to open a circuit in the case of an overload or short-circuit currents. Typically provided through fuses and breakers.
A flow of electric charge that regularly reverses its direction?
An exposed armored cable that is an assemble of insulated wires, bound together and enclosed in a protective armor made of a spiral-wound interlocking strip of steel tape.
A Romex, nonmetallic, sheathed cable that is restricted to small building applications not exceeding 3 floors above grade.
Apecial power outlets that are placed on their own circuit. They prevent various types of electrical interference from disturbing sensitive electrical equipment connected to them?
A device designed to transmit electricity, very good materials = gold, silver, platinum, good materials = copper and aluminum
The proper, alternative name for a wall outlet or plug.
Allows electrons to pass through it to the earth to make the object neutral?
Overhead Service Drop
Connection to an utility line with an overhead service lateral to the building
Service Entrance Panel
A large metal box that receives power from the electric company's service drop or service lateral. It divides the power into individual circuits?
A conducting object through which a direct connection to earth is established?
A small electrical current that "leaks" from the hot wire to ground. It can produce a severe electric shock in damp locations (near a swimming pool) or where it is possible to touch an electric appliance and a metal water pipe at the same time (in a kitchen or bathroom)?
Electrical device that can interrupt the flow of electrical current when it is overloaded?
Automatic Transfer Switch
Transferring the power load from the building circuitry to standby generator or during brownout?
The maximum amount of current a wire can carry safely without overheating?
An unbroken neutral by means of a solid link within the switch in an effort to satisfy NEC's requirement that a grounded neutral conductor of a circuit should not be broken.
Provision for building with an expected electric load demand of 200KVA?
A pump provided on outdoor transformers to keep electrical dry>?>>?
Specifically designed cable consisting of two, three, or four No. 10 AWG conductors
Power Factor Correction
The closer the ratio is to 100 is the more efficient the power usage.
Operational state at all times; utility plants. Always producing power.
Remote Control Switch
A contactor switch that latches mechanically after being operated. To unlatch the switch must be reenergized
A passage (a pipe or tunnel) through which electric wires can pass?
National Electric Code
A device used to produce electricity from light?
a material through which electric current does not pass easily, good materials = glass, mica, rubber, oil, distilled water, porcelain
Underground Service Drop
Connection to an underground utility line with an buried service lateral to the building
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