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 RadioShack Consumer Electronics Glossary: E

Electronics: see Electromotive Force (Voltage) or Emitter.
e-: see exa- (e-).
E-10 Base: see Base, E-10.
E-10 Base: see Base, E-5.
Weather: A sudden, transient motion or trembling of the earth's crust, resulting from the waves in the earth caused by faulting of the rocks or by volcanic activity.
Earth Station
Satellite: A ground-based antenna and equipment designed to either transmit data to or receive data from a satellite.
Acronym: Emergency Alert System
Weather: The Emergency Alert System is an emergency announcement service provided by the FCC.
Acronym: Emergency Broadcast System
Weather: The original emergency announcement service provided by the FCC. It has been replaced by the EAS.
Acronym: Emitter-Coupled Logic
Electronics: A logic gate that is designed to operate at extremely high speeds. Also called Current Mode Logic (CML).
Eddy Current: see Current, Eddy.
Acronym: Enhanced Data rates for Global Evolution
Telephony: An enhancement for the GSM and TDMA standards that will allow wireless multimedia services and applications across the applicable bands. EDGE expands radio timeslots to 48 kbps. When combined with GPRS, it gives a maximum bandwidth of 384 kbps. Also called E-GPRS (Enhanced GPRS).
Acronym: Electrically Erasable Programmable Read-Only Memory
Electronics, Computers: A type of memory that can be erased using an electrical charge, but which retains the information even without power.
Effective Value
Electronics: The amount of AC current that produces the same amount of heat in a resistor as a corresponding amount of DC current.
Acronym: Enhanced General Packet Radio Service
Telephony: see EDGE.
ei-: see exbi (ei-).
Electret Microphone: see Microphone, Electret.
Electrically Erasable Programmable Read-Only Memory: see EEPROM.
Electric Field
Electronics: A field or force that exists in the space between two different potentials or voltages. Also known as an electrostatic field.
DIY, Electronics: The energy that is produced by a flow of electrons affected by an electromotive force that is produced either electrostatically, mechanically, chemically or thermally.
Electronics: A conductor through which a current enters or leaves a component.
Electronics, Batteries: A conductive liquid (wet) or paste (dry).
Electrolytic Capacitor: see Capacitor, Electrolytic.
Electromagnetic Field
Metal Detectors: An invisible force extending from top to bottom of the search coil and created by the flow of alternating oscillator frequency current around the transmit winding.
Electromagnetic Radiation
Weather: Waves of energy propagated though space or through a material media. Also called radiation
Electromagnetic Spectrum
Weather: The band of electromagnetic radiation with components that are separated into their relative wave lengths. The portion of the spectrum that the human eye can detect is called visible light, between the longer infrared waves and the shorter ultraviolet waves. The various types of energy comprising the spectrum are (from longest to shortest) radio, infrared, visible, ultraviolet, x-rays, gamma rays, and cosmic rays.
Electromotive Force (E): see EMF.
DIY, Electronics: One of the basic atomic particles. Electrons have a negative charge and rotate around the positively charged nucleus of an atom.
Electronic Pinpointing
Metal Detectors: An automated detuning feature which narrows signal response for the purpose of target pinpointing.
Electronic Serial Number: see ESN.
Electrostatic Field
DIY, Electronics: An electrical field that surrounds objects that have an electrical charge.
Electrostatic Speaker: see Speaker.
Electrostatic Microphone: see Microphone, Capacitor.
Satellite: Refers to the up/down angle on a satellite dish antenna.
Weather: The measure of height with respect to a point on the earth's surface above mean sea level. Sometimes referred to as station elevation.
Emergency (Weather)
Weather: "An event that by itself would not kill or injure or do property damage but indirectly may cause other things to happen that result in a hazard. Example, a major power or telephone loss in a large city alone is not a direct hazard but disruption to other critical services could create a variety of conditions that could directly threaten public safety."
(taken from NWR's "Detailed SAME Specification File" (
Acronym: ElectroMotive Force
Electronics: The maximum potential difference between two electrodes of a voltaic cell. See Voltage.
Emitter (E)
Electronics: The semiconductor region from which charge carriers are injected into the base of a bipolar junction transistor.
Emitter-Coupled Logic: see ECL.
Emitter Feedback
Electronics: Coupling from the emitter output to the base input of a bipolar junction transistor.
Emitter Follower
Electronics: A common collector amplifier. Has a high current gain, high input impedance and low output impedance.
Acronym: Emotion Icon
Internet: Emoticons are symbols made up of punctuation marks which are used to indicate the writer's mood or intent in e-mail or other on-line communication. Examples of emoticons are :-) and :-( which indicate happy and sad. Emoticons are also called Smileys.
Acronym: Enhanced Messaging Service
Telephony: EMS is the second phase of message service development, and allows the transmission of black-and-white images as well as basic sounds. Like SMS (Short Messaging Service), information is sent through the network using open frequencies in the existing network. The next phase is MMS (Multimedia Messaging Service), which adds advanced video and voice capabilities.
Audio: The housing into which a speaker driver is installed.
DIY: A metal, wooden or plastic compartment into which a project or circuit is built.
Enclosure, Vented
Audio: A speaker enclosure with a hole or tube between the inside and outside of the enclosure. Vented enclosures are used to extend the bass response of the speaker, as the vent or port also generates sound. Also called Bass-reflex.
Computers: To format data in a way so that it can be read by a particular application.
Audio: To convert an audio file into another format, such as converting a WAV file into an MP3 file.
Computers: The method of protecting and maintaining security for any kind of database, network or file. To read an encrypted file, you must have access to a password or key.
Enhanced Parallel Port: see EPP.
Enhanced Specialized Mobile Radio: see ESMR.
Enhancement-mode MOSFET: see MOSFET, Enhancement-mode.
GPS: Current satellite position and timing information transmitted as part of the satellite data message. A set of ephemeris data is valid for several hours.
Acronym: Enhanced Parallel Port
Computers: A high-speed, bi-directional printer port on modern computers used by some digital cameras and scanners.
Audio: An electronic mechanism, sometimes abbreviated EQ, used for adjusting the volume of selected frequency ranges. Commonly used to enhance different frequencies such as treble and bass in certain styles of music.
Measurement: An imaginary circle on the surface of the earth, which is equal in distance from the poles and which divides the earth into the northern and southern hemispheres.
Measurement: Cgs unit for energy; equal to (dyne * cm).
Acronym: Enhanced Specialized Mobile Radio
Telephony: Digital mobile telephone services offered to the public over channels previously used for two-way analog dispatch services. See also SMR.
Acronym: Electronic Serial Number
Telephony: A 32-bit code that is unique to each mobile unit and that is used to validate cellular telephones.
Measurement: Cgs unit for charge; equal to 3.336*10-10 coulombs.
Acronym: Extended Total Access Communications Systems
Telephony: The conventional wireless technology used in the United Kingdom and other countries. It was developed from the AMPS technology used in the United States.
Computers, Networking: A system of hardware and software for local area networks (LAN's) developed in 1976 by Xerox, DEC and Intel.
Acronym: European Telecommunications Standards Institute
Telephony: The mission of ETSI is "to produce the technical standards which are necessary to achieve a large unified European telecommunications market". This includes the specification of the GSM cellular and PCS standard.
Acronym: Evaluative-Through The Lens
Digital Video: An exposure system used by Canon« that uses a brief pre-flash before the main flash to calculate the exposure index.
European Telecommunications Standards Institute: see ETSI.
Evaluative-Through The Lens: see E-TTL.
exa- (E-)
Measurement: SI / Metric unit of decimal measurement, equal to 1018 or 1,000,000,000,000,000,000.
Measurement, Computers: Unit of binary measurement, equal to 260 or 1, 152, 921, 504, 606, 846, 976.
exbi- (Ei-)
Measurement, Computers: New SI / Metric unit of binary measurement, not yet fully adopted, equal to 260 or 1, 152, 921, 504, 606, 846, 976.
Digital Video: The embedded camera and exposure information that a digital camera puts in the header of the JPG files it creates. Many programs can read and display this information.
Exit Pupil
Binoculars: The width of the beam of light exiting the eyepiece (equal to the aperture divided by the magnification).
Computers: To print, compress or save a data file using a particular file format or function.
Digital Video: The amount of light that reaches the image sensor. Exposure is controlled by a combination of the lens aperture and shutter speed.
Extended Total Access Communications Systems: see ETACS.

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