Obsolete synchros with reverse rotation and limited torque capabilities [15].
IDEMPOTENT LAW
In Boolean algebra, combining a quantity with itself either by logical addition or logical multiplication will result in a logical sum or product that is the equivalent of the quantity (for example, A + A = A; A • A = A) [13].
IDENTITY LAW
In Boolean algebra, the law which states that any expression is equal to itself
IDLER FREQUENCY
In a parametric amplifier, the difference between the input signal and the pump signal frequency. Also called the LOWER-SIDEBAND FREQUENCY [11].
IF AMPLIFIER
Usually a narrow-bandwidth IF amplifier that is tuned to one of the output frequencies produced by the mixer [18].
IGFET
Any field-effect transistor that has an insulated gate [7].
IMAGE FREQUENCY
An undesired frequency capable of producing the desired frequency through heterodyning [17].
IMPEDANCE
The total opposition offered to the flow of an alternating current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance. The symbol for impedance is Z [2] [9].
IMPLOSION
The inward bursting of a CRT because of high vacuum. The opposite of explosion [6].