18WuD2x

inductive trimmer • inertial guidance 363
Reactance (ohms)
Reactance (ohms)
6000
4000
2000
L = 100 µH
0
0 2 4 6 8 10
600
400
200
Frequency (MHz)
f = 1 MHz
0
0 20 40 60 80 100
Inductance (µH)
inductive reactance
inductive trimmer See TRIMMER INDUCTOR.
inductive tuning Also called permeability tuning.
In a radio receiver, transmitter or transceiver, the
adjustment of frequency by changing the inductance
of a coil having a movable core.
inductivity See DIELECTRIC CONSTANT.
inductometer An instrument for measuring inductance
in terms of the resonant frequency of an
INDUCTANCE-CAPACITANCE (LC) circuit, in
which L is the unknown inductance and C is calibration
capacitance.
inductor A coil of wire wound according to various
designs, with or without a core of ferromagnetic
material, to concentrate the magnetic flux resulting
from current flowing in the wire. The coiling of
the wire and/or the addition of a ferromagnetic
core increases the self-inductance compared with
that of a straight wire having the same length.
Also see INDUCTANCE; INDUCTION, 1; and
SELF-INDUCTANCE, 1.
inductor alternator See ALTERNATOR.
inductor amplifier See MAGNETIC AMPLIFIER.
inductor decade See DECADE INDUCTOR.
inductor microphone See INDUCTIVE MICRO-
PHONE.
inductors in parallel See PARALLEL INDUCTORS.
inductors in parallel-series See PARALLEL-
SERIES INDUCTORS.
inductors in series See SERIES INDUCTORS.
inductors in series-parallel See SERIES-PARAL-
LEL INDUCTORS.
inductor substitution box An enclosed assortment
of common-value inductors that can be
switched, one at a time, to a pair of terminals. In
troubleshooting and circuit development, any of
several useful fixed inductances can be thus obtained.
industrial data processing Abbreviation, IDP. The
application of digital computers and associated
equipment to industrial problems, through the
classification, sorting, storing, and manipulation
of information.
industrial electronics The branch of electronics
concerned with manufacturing processes and
their control, and with the operation and safeguarding
of factories.
industrial instrumentation 1. Supplementing an
industrial process with electrical and electronic
measuring instruments. 2. The instruments used
for the purpose defined in 1.
industrial television Abbreviation, ITV. A usually
closed-circuit television (CCTV) system, used as
an adjunct to a manufacturing process, or as a
means of communication or surveillance within
an industrial plant.
industrial robot A robotic device used in industrial
applications (e.g., mining, construction,
manufacturing, or laboratory work).
industrial tube An (often heavy-duty) highly reliable
vacuum tube designed expressly for industrial
service, such as high-power radio or
television broadcasting.
ineffective time The period during which an otherwise
operational computer is not being used effectively
because of delays or idle time.
inelastic collision A collision between charged
particles in which one gains energy and the other
loses energy.
inert gas A gas that does not readily react with
other elements. Inert gases include argon, helium,
krypton, neon, and xenon. Such gases are often
used in hermetically sealed devices to retard corrosion.
inertance See ACOUSTIC INDUCTANCE.
inertia The tendency of a body at rest to remain at
rest unless acted on by an outside force. Also, the
tendency for a body in motion to maintain that
motion unless acted on by an outside force. Compare
MOMENTUM.
inertia in electric circuit The condition in a circuit
containing inductance, in which a current
change lags behind a voltage change (analogous
to mechanical inertia; see INERTIA).
inertial guidance A system that automatically
guides missiles and satellites in a desired trajectory
without the need for continuous control by
signals from a station.