Electronics (Mike Jaroch)
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Fakasiosio e kolosalii ngaue'aki e fakamatala fakahokohoko ko 'eni
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OCTAL NUMBER SYSTEMA number system based on powers of eight. This system is used extensively in computer work [13]. | |
OFF-LINE TEST EQUIPMENTEquipment that tests and isolates faults in modules or assemblies removed from systems [14]. | |
OHMThe unit of electrical resistance. That value of electrical resistance through which a constant potential difference of 1 volt across the resistance will maintain a current flow of 1 ampere through the resistance [1]. | |
OHM'S LAWThe current in an electrical circuit is directly proportional to the electromotive force in the circuit. The most common form of the law is E = IR, where E is the electromotive force or voltage across the circuit, I is the current flowing in the circuit, and R is the resistance of the circuit [1]. | |
OHMIC VALUEResistance in ohms [1]. | |
OHMMETERA meter used to measure resistance [3] [16]. | |
OHMS PER SQUAREThe resistance of any square area of thin film resistive material as measured between two parallel sides [14]. | |
OILCAN TUBEA type of planar tube, similar to the lighthouse tube, which has cooling fins. The oilcan tube is designed to handle large amounts of power at uhf frequencies [6]. | |
OMNIDIRECTIONAL ANTENNAAn antenna that radiates and receives equally in all directions (nondirectional) [10] [18]. | |
ON-LINE TEST EQUIPMENTContinuously monitors the performance of electronic systems [14]. | |
OPAQUEThose substances that do not transmit (pass) any light rays; that is, the light rays are either absorbed or reflected [10]. | |
OPEN CIRCUIT(1) The condition of an electrical circuit caused by the breaking of continuity of one or more conductors of the circuit; usually an undesired condition. (2) A circuit that does not provide a complete path for the flow of current [1]. | |
OPEN-ENDED LINEA transmission fine that has a terminating impedance that is infinitely large [10]. | |
OPERATIONAL AMPLIFIERAn amplifier designed to perform computing or transfer operations and that has the following characteristics: (1) very high gain, (2) very high input impedance, and (3) very low output impedance [8]. | |
OPTICAL COUPLERA coupler composed of an LED and a photodiode and contained in a light- conducting medium. Suitable for frequencies in the low-megahertz range [7]. | |
OPTIMUM WORKING FREQUENCYThe most practical operating frequency that can be used with the least amount of problems and is roughly 85 percent of the maximum usable frequency [10]. | |
OPTOELECTRONIC DEVICESDevices that either produce or use light in their operation [7]. | |
OR GATEA gate that performs the logic OR function. It produces an output 1 whenever any or all of its inputs is/are 1 [13]. | |
ORDER-WIRE CIRCUITA circuit between operators used for operations control and coordination [17]. | |
ORGANIZATIONAL-LEVEL MAINTENANCEResponsibility of the user organization [14]. | |
ORIGINThe point on a graph where the vertical and horizontal axes cross each other [10]. | |
OSCILLATORAn oscillator is a nonrotating device that produces alternating current. The frequency is determined by the characteristics of the device [9]. | |
OUT-OF-CIRCUIT METERA meter that is not permanently installed in a circuit. Usually portable and self-contained, these meters are used to check the operation of a circuit or to isolate troubles within a circuit [3]. | |
OUTPUT ENDThe end of a transmission line that is opposite the source; receiving end [10]. | |
OUTPUT IMPEDANCEThe impedance that is presented to the load by the transmission line and its source [10]. | |
OVERDRIVENWhen the input signal amplitude is increased to the point that the transistor goes into saturation and cutoff [7]. | |
OVERMODULATION A condition that exists when the peaks of the modulating signal are limited [12]. | |