ELEMENT-- A substance, in chemistry, that cannot
ELECTROCHEMIC-- The action of converting
be divided into simpler substances by any means
chemical energy into electrical energy.
ordinarily available.
ELECTRODE-- The terminal at which electricity
F
passes from one medium into another, such as
in an electrical cell where the current leaves or
F E R R O M A G N E T I C M A T E R I A L -- A highly
returns to the electrolyte.
magnetic material, such as iron, cobalt, nickel,
or alloys, that makes up these materials.
ELECTRODYNAMICS METER MOVEMENT-- A
meter movement using freed field coils and
FIELD OF FORCE-- A term used to describe the
moving coil; usually used in wattmeters.
total force exerted by an action-at-a-distance
phenomenon such as gravity upon matter,
ELECTROLYTE-- A solution of a substance that is
electric charges acting upon electric charges,
capable of conducting electricity. An electrolyte
magnetic forces acting upon other magnets or
may be in the form of either a liquid or a paste.
magnetic materials.
E L E C T R O M A G N E T -- A n electrically excited
FIXED RESISTOR-- A resistor having a definite
magnet capable of exerting mechanical force, or
resistance value that cannot be adjusted.
of performing mechanical work.
FLUX-- In electrical or electromagnetic devices, a
ELECTROMAGNETIC-- The term describing the
general term used to designate collectively all
relationship between electricity and magnetism.
the electric or magnetic lines of force in a
Having both magnetic and electric properties.
region.
ELECTROMAGNETIC INDUCTION-- T h e
FLUX DENSITY-- The number of magnetic lines of
production of a voltage in a coil due to a change
force passing through a given area.
in the number of magnetic lines of force (flux
linkages) passing through the coil.
FREQUENCY METER-- A meter used to measure
the frequency of an ac signal.
ELECTROMOTIVE FORCE (EMF)-- The force that
causes electricity to flow between two points
G
with different electrical charges or when there is
a difference of potential between the two points.
The unit of measurement in volts.
GALVANOMETER-- A meter used to measure small
values of current by electromagnetic or
electrodynamics means.
ELECTRON-- The elementary negative charge that
revolves around the nucleus of an atom.
GROUND POTENTIAL-- Zero potential with
respect to the ground or earth.
ELECTRON SHELL-- A group of electrons which
have a common energy level that forms part of
H
the outer structure (shell) of an atom.
H E N R Y ( H ) -- The electromagnetic unit of
ELECTROSTATIC-- Pertaining to electricity at rest,
inductance or mutual inductance. The
such as charges on an object (static electricity).
inductance of a circuit is 1 henry when a current
variation of 1 ampere per second induces 1 volt.
ELECTROSTATIC METER MOVEMENT-- A
It is the basic unit of inductance. In radio,
meter movement that uses the electrostatic
smaller units are used such as the millihenry
repulsion of two sets of charges plates (one
(mH), which is one-thousandth of a henry (H),
freed and the other movable). This meter
and the microhenry (h), which is one-millionth
movement reacts to voltage rather than to
of a henry.
current and is used to measure high voltage.
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