FAIL-- The loss of the control signal or power to a
ELECTROLYTIC SOLUTION-- A solution that
component. Also, the breakage or breakdown of a
conducts electric current by the movement of ions.
component or component part.
ELECTROMAGNET-- An electrically excited
FAIL POSITION-- The operating or physical position
magnet capable of exerting mechanical force or of
to which a device will go upon loss of its control
performing mechanical work.
ELECTROMAGNETIC-- The term describing the
FEEDBACK-- A value derived from a controlled
relationship between electricity and magnetism;
function and returned to the controlling function.
having both magnetic and electric properties.
FERROMAGNETIC MATERIAL-- A highly
ELECTROMAGNETIC INDUCTION-- The pro-
magnetic material, such as iron, cobalt, nickel, or
duction of a voltage in a coil due to a change in the
passing through the coil.
FIELD OF FORCE-- A term used to describe the total
force exerted by an action-at-a-distance
ELECTROMOTIVE FORCE (emf)-- The force
phenomenon, such as gravity upon matter, electric
(voltage) that produces an electric current in a
charges acting upon electric charges, magnetic
circuit. The force that causes electricity to flow
forces acting upon other magnets or magnetic
between two points with different electrical charges
or when there is a difference of potential between
FIXED RESISTOR-- A resistor having a definite
the two points. The unit of measurement is volts.
resistance value that cannot be adjusted.
ELECTRON-- The elementary negative charge that
FLUX-- In electrical or electromagnetic devices, a
revolves around the nucleus of an atom.
general term used to designate collectively all the
ELECTRON SHELL-- A group of electrons that have
electric or magnetic lines of force in a region.
a common energy level that forms part of the outer
FLUX DENSITY-- The number of magnetic lines of
structure (shell) of an atom.
force passing through a given area.
ELECTROSTATIC-- Pertaining to electricity at rest,
FREQUENCY METER-- A meter used to measure
such as charges on an object (static electricity).
the frequency of an ac signal.
FUNCTION-- To perform the normal or characteristic
meter movement that used the electrostatic
action of something, or a special duty or
repulsion of two sets of charged plates (one fixed
performance required of a person or thing in the
and the other movable). This meter movement
course of work.
reacts to voltage rather than to current and is used
GALVANIC CORROSION-- Corrosion of a metal
to measure high voltage.
because of electrical contact with a more noble
ELEMENT-- A substance, in chemistry, that cannot be
metal or nonmetallic conductor in a corrosive
divided into simpler substances by any means
environment. Often used to refer specifically to
bimetallic corrosion; sometimes called couple
EMBRITTLEMENT-- Severe loss of ductility of a
metal or alloy.
GALVANIC COUPLE-- Two or more dissimilar
conductors, commonly metals, in electrical contact
EMERGENCY-- An event or series of events in
in the same electrolytic solution.
progress that will cause damage to equipment
unless immediate, timely, and correct procedural
GALVANIC SERIES-- A list of metals and alloys
steps are taken.
arranged according to their relative corrosion
potentials in a given environment. Note that this
EXTERNAL CIRCUIT-- Wires, connectors,
may not be the same order as in the electromotive
measuring devices, current sources, and so forth,
that are used to bring about or measure the desired
electrical conditions within the test cell. Also
GALVANOMETER-- A meter used to measure small
values of current by electromagnetic or
known in corrosion parlance as that part of an
electrochemical cell external to the solution.