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Neets Master Glossary - 14192_84
Neets Master Glossary - 14192_86

Neets Module 20-Master Glossary
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1-75 THERMAL RUNAWAY—A conduction that exists when heat causes more electron-hole pairs to be generated, which, in turn, causes more heat and which may eventually cause diode destruction [7]. THERMAL TRIP ELEMENT—A circuit breaker trip element that uses the increased bending of a bimetallic strip caused by increased current to open a circuit [3]. THERMIONIC EMISSION—Emission of electrons from a solid body as a result of elevated temperature [6]. THERMISTOR—(1) A semiconductor device whose resistance varies with temperature [4]. (2) A type of bolometer characterized by a decrease in resistance as the dissipated power increases [16]. THERMOCOUPLE—A junction of two dissimilar metals that produces a voltage when heated [1]. THERMOCOUPLE METER MOVEMENT—A meter movement that uses the current induced in a thermocouple by the heating of a resistive element to measure the current in a circuit; used to measure ac or dc [3]. THERMOPLASTIC—A synthetic mixture of rosins that is flexible and used as an insulting material. Generally used as an insulator for low- and medium-range voltages [4]. THETA—The Greek letter ( ) used to represent phase angle [2]. THICK FILM COMPONENTS—Passive circuit components (resistors and capacitors) having a thickness of 0.001 centimeter [14]. THIN FILM COMPONENTS—Passive circuit elements (resistors and capacitors) deposited on a substrate to a thickness of 0.0001 centimeter [14]. THREE-ELEMENT ARRAY—An array with two parasitic elements (reflector and director) and a driven element [10]. THREE-DIMENSIONAL RADAR (3D)—A radar set that measures the range, bearing and altitudes of a target [18]. THROW—In a switch, the number of different circuits each pole can control; for example, single throw and double throw [3]. THYRATRON—A gas tube used as a modulator switching device [18]. THYRATRON TUBE—A gas-filled triode in which a sufficiently large positive pulse applied to the control grid ionizes the gas and causes the tube to conduct, after which the control grid has no effect in conduction [6] [12]. TICKLER COIL—A small coil connected in series with the collector or plate circuit of a transistor or tube and inductively coupled to the base or grid-circuit coil to establish feedback (regeneration) [9]. TIME CONSTANT—Time required for an exponential quantity to change by an amount equal to 63.2 percent of the total change that can occur [2] [9]. TIME-DIVISION MULTIPLEXING—The process that periodically samples the full 360 degrees of each sine wave. The sample can be of a received signal or of a signal to be transmitted [17].






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