18WuD2x

238 electrode efficiency • electrokinetics
possible theoretical yield. This value ranges between
0 and 1 (0 percent and 100 percent).
electrode impedance The impedance encountered
by alternating current flowing through an electrode;
the property is entirely that of the electrode
and is the reciprocal of ELECTRODE ADMIT-
TANCE. Consists of a real-number component
(ELECTRODE RESISTANCE) and an imaginarynumber
component that is 90 degrees out of
phase (ELECTRODE REACTANCE).
electrodeless discharge Discharge in a gas tube
that is not directly connected to a power source.
A familiar example is the glow of a neon lamp held
in a strong radio-frequency (RF) electromagnetic
field.
electrodeposit 1. To deposit a substance by electrical
action. Also see ELECTROPHORESIS and
ELECTROPLATING. 2. A deposit that is formed
on an electrode by electrophoresis or electroplating.
electrodeposition The electrical application of a
layer of one material (such as a metal) on the surface
of another (the substrate) (e.g., electroplating,
evaporation, and sputtering).
electrode potential See ELECTRODE VOLTAGE.
electrode reactance The imaginary-number component
of ELECTRODE IMPEDANCE.
electrode resistance The resistance encountered
by current flowing through an electrode; the
property is entirely that of the electrode and is the
reciprocal of ELECTRODE CONDUCTANCE.
electrodermography A method of monitoring
the functions of the human body by measuring
the resistance between two electrodes placed on
the surface of the skin.
electrode susceptance The imaginary-number
component of ELECTRODE ADMITTANCE.
electrode voltage The voltage between an electrode
and a reference point, such as ground or
another electrode.
electrodiagnosis 1. The diagnosis of a disease or
disorder through the use of electromedical instruments.
2. Troubleshooting the electrical portion
of electromechanical equipment.
electrodialysis See ELECTRO-OSMOSIS.
electrodissolution Dissolving a constituent substance
of an immersed electrode by means of
electrolysis.
electrodynamic Pertaining to electricity in motion
(i.e., current flow and its accompanying electric
and magnetic fields).
electrodynamic braking Stopping a tape-deck
motor quickly by applying a braking voltage. In
this method, direct braking current flows through
the shaded-pole alternating-current (ac) reel
motor.
electrodynamic instrument See ELECTRODY-
NAMOMETER.
electrodynamic loudspeaker See DYNAMIC
SPEAKER.
electrodynamics The branch of physics concerned
with moving electric charge carriers,
such as electrons, holes, and ions. Also concerned
with the interaction of electrical and mechanical
phenomena. Important in the design
and manufacture of devices, such as motors and
generators.
electrodynamic speaker See DYNAMIC SPEAKER.
electrodynamism See ELECTRODYNAMICS.
electrodynamometer An indicating meter whose
movable coil rotates between two stationary coils.
All three coils are connected in series, and the
magnetic fields of the two stationary coils are additive.
This meter produces a positive indication
for alternating current (ac), as well as for direct
current (dc). Can be adapted for use as an ammeter,
voltmeter, or wattmeter.
electroencephalogram Abbreviation, EEG. A
record made by an ELECTROENCEPHALO-
GRAPH, showing changes in electric potential resulting
from bioelectric action in the brain. The
record is used as a diagnostic aid.
electroencephalograph An instrument that produces
a record of voltage changes resulting from
the brain’s bioelectricity.
electroencephaloscope A type of oscilloscope
used to pick up, amplify, and display changes in
potential caused by the brain’s bioelectric action.
electroextraction Extracting a substance from a
mixture (e.g., a metal from an ore) by an electrical
process, such as electrolysis.
electroform 1. To precondition a material or device
(e.g., a semiconductor junction) by passing a
current through it for a specified period. 2. To
form articles by electrodepositing material on a
mold or core.
electrogalvanized Electroplated with zinc.
electrogastrogram A recording of the electrical impulses
and other functions of the stomach, for
medical diagnostic purposes.
electrograph 1. A picture transmitting or receiving
device (see FACSIMILE RECEIVER and FACSIM-
ILE TRANSMITTER). 2. A device used for the electrolytic
etching or transfer of designs.
electrographic recording A method of producing
a visible pattern or record, using electrodes to
create discharge through an insulating material.
electrographite Synthetic graphite prepared by
heating carbon in an electric furnace.
electrojet A region of high current concentration
in the sky near bright auroral displays or along
the magnetic equator.
electrokinetic energy The energy of electric
charge carriers in motion; a form of kinetic energy.
The current in a wire (a flow of electrons) is
a common manifestation of this form of energy.
Compare ELECTROSTATIC ENERGY.
electrokinetics A branch of electricity concerned
with (1) the behavior of moving charged particles
(such as ions and molecules) and bodies in