dwell time
The length of time that a thing or person remains in a given state.
Electrical engineering
651 entries in this trade.
dynamic IP address
An IP address which changes periodically, when each time a user connects to their internet service provider.
dynamo
An electricity generator; a dynamo-electric machine.
Early effect
The variation in the effective width of the base in a bipolar junction transistor due to a variation in the applied base-to-collector voltage.
eavesdropping
The interception of electronic communication.
EDFA
Initialism of Erbium-Doped Fiber Amplifier.
EDGE
Acronym of Enhanced Data rates for GSM Evolution.
EF
Initialism of electric field.
EGPRS
Initialism of enhanced General Packet Radio Service.
electric current
The net charge that passes through some cross-section of a conducting material (in one direction), per unit time.
electric field
A region of space around a charged particle, or between two voltages, which exerts a force on charged objects in its vicinity.
electric flux
The measure of flow of the electric field through a given area.
electric main
The principal or main electrical supply line that distributes electricity from the utility grid to a building or home.
electric potential
The potential energy per unit charge at a point in a static electric field.
electric power transmission
The movement of large amounts of electrical energy from the site of generation to a substation.
electrical fault
A defect that forms from a fault current.
electrolytic capacitor
A capacitor that uses an electrolyte as one of its capacitative plates.
electron multiplier
A vacuum-tube structure that multiplies incident charges by means of secondary emission.
electrostatic
adjectiveElectrical engineering
of, relating to, or produced by electrostatics or static electricity
electrostatic force
Coulomb force, the attraction or repulsion between particles based on their electric charge.
ELFEXT
Initialism of equal-level far-end crosstalk.
EMC
Initialism of electromagnetic compatibility.
emitter-coupled logic
A logic family that achieves high speed by using an overdriven BJT differential amplifier with single-ended input.
end-node
A device that connects to a network and is the endpoint for data communication.
endpoint
The entity at one end of a connection.
engaged tone
An audible signal to the calling party that indicates failure to complete the requested connection; a busy signal.
EPROM
Initialism of erasable programmable read-only memory.
equivalence gate
a logic gate performing a Boolean logic equivalence operation; an XNOR gate.
ERC
Initialism of easily-recognizable code.
erlang
A dimensionless statistical measure of the volume of telecommunications traffic relative to the capacity of a single channel.
EROI
Initialism of energy return on investment.
ERP
Initialism of effective radiated power or equivalent radiated power.
error
To show or contain an error or fault.
errored
adjectiveElectrical engineering
Containing one or more errors; faulty.
escape character
A single metacharacter, usually a control code, which in a sequence of characters signifies that what is to follow takes an alternative interpretation. The term escape sequence refers to the escape character and the subsequent character or characters so modified.
escape sequence
An escape character together with subsequent characters, not output as written, but specifying a particular behaviour.
eSIM
Initialism of embedded SIM (“virtual SIM that is integrated in the cellular device”).
ESR
Initialism of equivalent series resistance.
essential mesh
In mesh analysis: a simple mesh (loop) which does not contain any other meshes.
essential prime implicant
A prime implicant on a Karnaugh map which "covers" at least one 1 which is not covered by any other prime implicant.
ETSI
Initialism of European Telecommunication Standards Institute.
evanescent
adjectiveElectrical engineering
Of an oscillating electric or magnetic field: not propagating as an electromagnetic wave but having its energy spatially concentrated in the vicinity of its source.
exchange
The portion of a telephone number that represents (or formerly represented) a central office.
exit code
A sequence of digits that must be dialled before the target number when placing an international call from a given country.
exit node
A server that allows traffic to leave a secure network and enter the public internet.
extension
A numerical code used to indicate a specific telephone in a telecommunication network.
extension reel
An extension lead that rolls up, usually into the socket end, which in some cases has more than one socket on it (often 2 or 4).
extremely low frequency
The band of radio frequencies from 3 to 30 hertz.
FAB
Used to acknowledge that a message has been received and understood.
fade in
To commence with silence in a song and then slowly increase the volume of the music until the intro of the song is over.
fade out
To decrease in volume, such as at the end of a song, until there is only silence.
fall time
The amount of time taken for the amplitude of a pulse to decrease from a specified value to another specified value.
far field
The region sufficiently distant from a radio antenna for angular field distribution to be independent of distance.
far-field
adjectiveElectrical engineering
Of or pertaining to the far field.
fast busy signal
An audible signal on a voice phone line that sounds more frequently than a standard busy signal, indicating that no transmission path to the called phone number is available.
fast telegram
A telegram sent during either the day or night at a full rate for immediate delivery, typically with a minimum charge for 10 words or less.
fault current
An irregularity in an electric current that leads to an electrical fault.
FCD
Initialism of floating car data (“a method to determine the traffic speed on a road network”).
FDD
Initialism of frequency-division duplex.
FDR
Initialism of false transmit format detection ratio (in UMTS).