Monday, 29 April 2024, 1:18 PM
Site: edulabs.org academy
Course: Activity Examples (Activity Examples)
Glossary: Electronics (Mike Jaroch)
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POWER FACTORThe ratio of the actual power of an alternating or pulsating current, as measured by a wattmeter, to the apparent power, as indicated by ammeter and voltmeter readings. The power factor of an inductor, capacitor, or insulator is an expression of their losses [2] [16]. |
POWER GAINIn an antenna, the ratio of its radiated power to that of a reference [11] [18]. |
POWER LOSS(1) The electrical power, supplied to a circuit, that does no work and is usually dissipated as heat [2] [4]. (2) The heat loss in a conductor as current flows through it [10]. |
POWER PENTODEA special purpose tube used to provide high-current gain or power mplification. Each grid wire is directly in line with the one before and after it, a fact which allows more electrons to reach the plate [6]. |
POWER RATIOSee POWER GAIN [11]. |
POWER STANDING-WAVE RATIOThe ratio of the square of the maximum and minimum voltages of a transmission line [10]. |
POWER SUPPLYA unit that supplies electrical power to another unit. It changes ac to dc and maintains a constant voltage output within limits [6] [7]. |
POWER-AMPLIFIER TRANSMITTERTransmitter that uses a series of power amplifiers to create a high level of power [18]. |
PREAMPLIFIERAn amplifier that raises the output of a low-level source for further processing without appreciable degradation of the signal-to-noise ratio [18]. |
PRECESSIONThe rotation of the spin axis of a gyro in response to an applied force. The direction of precession is always perpendicular to the direction of applied force [15]. |