1-77 TOTAL RESISTANCE—(RT) The equivalent resistance of an entire circuit. For a series circuit: RT= R1+ R2+ R3 ...Rn. For parallel circuits: TOXIC VAPORS—Vapors emitted by a substance that can do bodily harm [4]. TR RECOVERY TIME—Time required for a fired tr or atr tube to deionize to a normal level of conductance [18]. TRACK—Operational phase of a fire-control or track radar during which the radar beam is kept on the target [18]. TRACK RADAR—Radar that provides continuous range, bearing, and elevation data by keeping the RF beam on the target [18]. TRANSCONDUCTANCE—Transconductance is a ratio of the change in plate current to a change in grid voltage with the plate voltage held constant. Transconductance (gm) is usually expressed in micromhos or millimhos. Mathematically, TRANSFORMER—A device composed of two or more coils, linked by magnetic lines of force, used to transfer energy from one circuit to another [2]. TRANSFORMER EFFICIENCY—The ratio of output power to input power, generally expressed as a percentage. TRANSFORMER, STEP-DOWN—A transformer so constructed that the number of turns in the secondary winding is less than the number of turns in the primary winding. This construction will provide less voltage in the secondary circuit than in the primary circuit [2]. TRANSFORMER, STEP-UP—A transformer so constructed that the number of turns in the secondary winding is more than the number of turns in the primary winding. This construction will provide more voltage in the secondary circuit than in the primary circuit [2]. TRANSISTOR—A semiconductor device with three or more elements [7]. TRANSITION—The time it takes to shift from a mark to a space condition or from a space to a mark condition [17]. TRANSIT TIME—The time an electron takes to cross the distance between the cathode and the plate [6] [11].
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