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Previous set of
"I" Terms and definitions
IN PHASE. Applied to the condition that exists when two waves of the same frequency pass through their
maximum and minimum values of like polarity at the same instant.
INPUT. The current, voltage, power, or driving force applied to a circuit or device.
INPUT END. The end of a two-wire transmission line that is connected to a source.
INPUT IMPEDANCE. Impedance presented to the transmitter by the transmission line and its load.
INPUT/OUTPUT. Pertaining to either input or output or both, especially in data processors.
INSTANTANEOUS AMPLITUDE. The amplitude at any given point along a sine wave at a specific
instant in time.
INSTANTANEOUS AUTOMATIC GAIN CONTROL (IAGC). A circuit that can vary the gain of the
radar receiver with each input pulse to maintain a nearly constant output peak amplitude.
INSTANTANEOUS VALUE. The magnitude at any particular instant when a value is continually varying
with respect to time.
INSULATED. Separated from other conducting surfaces by a dielectric (including air space) offering
a high resistance to the passage of current. Note: When any object is said to be insulated, it is
understood to be insulated for the conditions to which it is normally subjected. Otherwise, it is, uninsulated.
INSULATION. A material used to prevent the leakage of electricity from a conductor and to provide
mechanical spacing or support as protection against accidental contact with the conductor.
INSULATION RESISTANCE. The resistance offered by an insulating material to current leakage.
INSULATOR. Material of such low conductivity that the flow of current through it can usually be
neglected. A device having high electrical resistance; used for supporting or separating conductors
so as to prevent undesired flow of current from the conductors to other objects.
INTEGRATED CIRCUIT (IC). A circuit in which many elements are fabricated and interconnected
by a single process (into a single chip), as opposed to a "nonintegrated" circuit in which the transistors,
diodes, resistors, and other components are fabricated separately and then assembled. Elements
inseparably associated and formed on or within a single substrate.
INTENSITY (OF SOUND). The measurement of the amplitude of sound energy. Generally synonymous
with loudness.
INTERACTION SPACE. The region in an electron tube where the electrons interact with an alternating
electromagnetic field.
INTERELECTRODE CAPACITANCE. The capacitance between the electrodes of an electron tube.
INTERFERENCE. Any disturbance that produces an undesirable response or degrades a signal.
INTERMEDIATE FREQUENCY (IF). A lower frequency to which an RF echo is converted for ease of
amplification.
INTERMEDIATE-LEVEL MAINTENANCE (SM&R Code I). Direct support and technical assistance
to user organizations. Tenders and shore-based repair facilities.
INTERMEDIATE POWER AMPLIFIER. The amplifier between the oscillator and final power
amplifier.
INTERPOLES. Small auxiliary poles, placed between main field poles, whose magnetic field opposes the
armature field and cancels armature reaction. Interpoles accomplish the same thing as compensating
windings.
INTERSECTION LAW. In Boolean algebra, the law which states that if one input to an AND gate is
already TRUE, then the output will depend upon the state of the other inputs only.
"I" definitions and terms
