18WuD2x

eddy-current loss • effective acoustic center 227
electromagnetic field. Eddy currents in the core of
a transformer give rise to such loss.
edge connector A terminal block with a number of
contacts, attached to the edge of a printed-circuit
board for easy plugging into a foundation circuit.
edge control In the manufacture of paper, a
robotic system for maintaining the width of a
sheet by sensing the edges and correcting the
machine accordingly. Transducers that sense the
passing edges deliver output signals proportional
to variations from standard width.
edge detection The ability of a machine vision system
to locate and follow boundaries. Used extensively
in mobile robots.
edge effect The extension of electric lines of flux
between the outer edges of capacitor plates. This
portion of the interplate field contributes a small
amount of capacitance. Because the lines of flux
are not confined to the space between plates, they
can cause capacitive coupling with external
bodies.
Positive plate of capacitor
Negative plate of capacitor
edge effect
Edge
lines
edge-punched card In digital computer operations,
a punched card whose edge is perforated in
a narrow column, the center being used for written
annotation.
edgewise meter A meter having a curved horizontal
scale; this arrangement allows mounting the
instrument edgewise in a panel.
edgewise-wound coil A coil made of a flat metal
strip cut in the shape of a coil spring. The design
allows the use of clips to vary the inductance, but
this advantage is often offset by the coil’s high
distributed capacitance.
edging In a color television picture, extraneous
color of a different hue than the objects around
whose edges it appears.
Edison base A threaded base on light bulbs, conetype
heaters, and some pilot lamps.
Edison battery A group of Edison cells connected
in series, parallel, or both, and contained in a single
package with two electrodes.
Edison cell A secondary (storage) cell in which the
active positive plate material consists of nickel
hydroxide held in steel tubes assembled into a
steel grid; the active negative plate material is
powdered iron oxide mixed with cadmium; the
electrolyte is potassium hydroxide. The open-
circuit voltage of the cell is typically 1.2 V at full
charge.
Edison distribution system A three-wire, 110- to
250-volt direct-current (dc) power-distribution
system.
Edison effect Thermionic emission of negatively
charged particles (electrons) from a hot filament
sealed in an evacuated bulb; they are attracted by
a cold, positively charged metal plate in the bulb.
E display A radar display in which the horizontal
coordinate indicates distance, and the vertical coordinate
indicates elevation.
edit 1. In tape recording, the modifying of the
recorded material by deleting (cutting out or erasing),
adding (splicing or overrecording), or changing
the sequence of the material by physically or
magnetically altering the tape. 2. In digital computer
operations, to make data ready for processing.
edit decision list In the editing of a digital audio/video
presentation, a record of every change
(cut and paste). The list is automatically made by
the computer and stored on disk for later reference
if needed.
editing 1. Alteration of a magnetic-tape recording
by means of splicing. 2. Alteration of data stored
in memory, either by adding information, removing
information, changing information, or (usually)
a combination of these operations.
EDL Abbreviation of EDIT DECISION LIST.
EDM Abbreviation of ELECTRICAL-DISCHARGE
MACHINING.
EDP Abbreviation of electronic data processing.
EDPC Abbreviation of ELECTRONIC DATA-
PROCESSING CENTER.
EDPM Abbreviation of ELECTRONIC DATA-
PROCESSING MACHINE.
EDPS Abbreviation of ELECTRONIC DATA-
PROCESSING SYSTEM.
EDT 1. Abbreviation of ethylene diamine tartrate (a
synthetic piezoelectric material). 2. Abbreviation
of Eastern Daylight Time.
EDU Abbreviation of electronic display unit.
educational robot A robot that can be programmed
for the purpose of teaching its users something.
Popular as an educational toy for children.
EDVAC Acronym for Electronic Discrete Variable
Automatic Computer, a development of the University
of Pennsylvania.
EE Abbreviation of ELECTRICAL ENGINEER or
ELECTRONICS ENGINEER.
E eff Symbol for EFFECTIVE VOLTAGE.
EEG Abbreviation of ELECTROENCEPHALO-
GRAM.
EEPROM Abbreviation of ELECTRICALLY
ERASABLE PROGRAMMABLE READ-ONLY
MEMORY. See PROM and ROM.
EES Abbreviation of EARLY EARLY SOUND.
effective acoustic center The apparent point of
propagation of spherically divergent sound waves
radiated by an acoustic generator.