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SECONDARY EMISSION

The liberation of electrons from an element, other than the cathode, as a
result of being struck by other high-velocity electrons [6].


SECONDARY LOOP

In a cooling system, the loop that transfers the heat from the heat source, such as electronic equipment, to the primary loop; usually distilled water [18].


SELECTIVITY

The ability of a receiver to select the desired signal and reject unwanted signals [9] [17].

SELENIUM

A chemical element with light-sensitive properties that makes it useful as a semiconductor material in metallic rectifiers [7].


SELF-BIAS

In a vacuum tube circuit, the voltage developed by the flow of current through a resistor in the grid or cathode leads [6].


SELF-EXCITED GENERATORS

DC generators in which the generator output is fed to the field to produce field excitation [5].


SELF-EXCITED METER

A term used to describe meters that operate from their own power sources
[16].


SELF-INDUCTION

(1) The production of a counterelectromotive force in a conductor when its own magnetic field collapses or expands with a change in current in the conductor [2]. (2) The phenomenon caused by the expanding and collapsing fields of an electron that encircle other electrons and retard the movement of the encircled electrons [10].


SELF-LUMINOUS BODIES

Objects that produce their own light [10].

SELF-SYNCHRONIZED RADAR

A type of radar in which the timing pulses are generated within the transmitter [18].



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