Electronics (Mike Jaroch)
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E-FIELDElectric field that exists when a difference in electrical potential causes a stress in the dielectric between two points [11]. | ||
E-TYPE T-JUNCTIONA waveguide junction in which the junction arm extends from the main waveguide in the same direction as the E-field in the waveguide [11]. | ||
ECHO(1) The reflection of the original sound wave as it bounces off a distant surface [10]. (2) The RF signal reflected back from a radar target [18]. | ||
ECHO BOX A resonant cavity device that is used to check the overall performance of a radar system. It receives a portion of the transmitted pulse and retransmits it back to the receiver as a slowly decaying transient [18]. | ||
ECLIPSEA condition in which the satellite is not in view or in direct line of sight with the sun. This happens when the earth is between them [17]. | ||
EDDY CURRENTInduced circulating currents in a conducting material that are caused by a varying magnetic field [2] [5]. | ||
EDDY CURRENT LOSSLosses caused by random current flowing in the core of a transformer. Power is lost in the form of heat [2]. | ||
EDISON EFFECTAlso called RICHARDSON EFFECT. The phenomenon wherein electrons emitted from a heated element within a vacuum tube will flow to a second element that is connected to a positive potential [6]. | ||
EFFECTIVE VALUESame as ROOT-MEAN-SQUARE [2]. | ||
EFFICIENCYThe ratio of output-signal power compared to the total input power, generally expressed as a percentage [1] [7]. | ||
ELASTICITYThe ability of a substance to return to its original state [10]. | ||
ELECTRIC (E) FIELDThe field of force that is produced as a result of a voltage charge on a conductor or antenna [10] [11]. | ||
ELECTRIC CURRENTThe flow of electrons [1]. | ||
ELECTRICAL CHARGESymbol Q, q. Electric energy stored on or in an object. The negative charge is caused by an excess of electrons; the positive charge is caused by a deficiency of electrons [1]. | ||
ELECTRICAL CHEMICALThe action of converting chemical energy into electrical energy [1]. | ||
ELECTRICAL POWER SYSTEMProvides the necessary input power [18]. | ||
ELECTRICAL SYMBOLSGraphic symbols used to illustrate the various electrical or electronic components of a circuit [4]. | ||
ELECTRICAL ZEROA standard synchro position, with a definite set of stator voltages, that is used as the reference point for alignment of all synchro units [15]. | ||
ELECTRICAL-LOCKA synchro zeroing method. This method is used only when the rotors of the synchros to be zeroed are free to turn and their leads are accessible [15]. | ||
ELECTRODEThe terminal at which electricity passes from one medium into another, such as in an electrical cell where the current leaves or returns to the electrolyte [1]. | ||
ELECTRODYNAMIC METER MOVEMENTA meter movement using fixed field coils and a moving coil; usually used in ammeters and wattmeters [3]. | ||
ELECTRODYNAMOMETERA meter using an electrodynamic movement to measure an electric current [16]. | ||
ELECTROLYSISThe process of changing the chemical composition of a material by passing an electric current through it [4] [11]. | ||
ELECTROLYTEA solution of a substance that is capable of conducting electricity. An electrolyte may be in the form of either a liquid or a paste [1]. | |
ELECTROMAGNETAn electrically excited magnet capable of exerting mechanical force or of performing mechanical work [1]. | ||
ELECTROMAGNETICThe term describing the relationship between electricity and magnetism. A quality that combines both magnetic and electric properties [1]. | ||
ELECTROMAGNETIC FIELDThe combination of an electric (E) field and a magnetic (H) field [10]. | ||
ELECTROMAGNETIC INDUCTIONThe production of a voltage in a coil because of a change in the number of magnetic lines of force (flux linkages) passing through the coil [1] [2]. | ||
ELECTROMAGNETIC INTERFERENCEMan-made or natural interference that degrades the quality of reception of radio waves [10] [17]. | ||
ELECTROMAGNETIC RADIATIONThe radiation of radio waves into space [10]. | ||
ELECTROMAGNETISMThe generation of a magnetic field around a current-carrying conductor [2] [3]. | ||
ELECTROMOTIVE FORCEThe force (voltage) that produces an electric current in a circuit [2]. | ||
ELECTRONThe elementary negative charge that revolves around the nucleus of an atom [1]. | ||
ELECTRON GUNAn electrode of a CRT that is equivalent to the cathode and control grid of conventional tubes. The electron gun produces a highly concentrated stream of electrons [6]. | ||
ELECTRON ORBITAL MOVEMENTThe movement of an electron around the nucleus of an atom [11]. | ||
ELECTRON SHELLA group of electrons which have a common energy level that forms part of the outer structure (shell) of an atom [1]. | ||
ELECTRON SPINThe movement of an electron around its axis [11]. | ||
ELECTRONIC COUNTER-COUNTERMEASURES (ECCM) CIRCUITSSee ANTIJAMMING CIRCUITS [18]. | ||
ELECTRONIC FREQUENCY COUNTERAn instrument that counts the number of cycles (pulses) occurring during a precise time interval [18]. | ||
ELECTRONIC SCANNINGScanning in which the axis of the beam is moved, relative to the antenna axis, in a desired pattern [18]. | ||
ELECTRONIC SWITCHA circuit that causes a start-and-stop switching action by electronic means [13]. | ||
ELECTRONIC TUNINGIn a reflex klystron, changing the frequency and output power of the tube by altering the repeller voltage [11]. | ||
ELECTRONIC-EQUIPMENT DEHYDRATORA device that provides an alternate dry-air input in the event of failure of the central dry-air system. It may include a compressor [18]. | ||
ELECTRONICS DRY-AIR BRANCHA common line for providing dry air to various electronic equipment, such as search radar, fire-control radar, and repeaters [18]. | ||
ELECTROSTATICPertaining to electricity at rest, such as charges on an object (static electricity) [1]. | ||
ELECTROSTATIC DEFLECTIONThe method of deflecting an electron beam by passing it between parallel charged plates mounted inside a cathode-ray tube [6]. | ||
ELECTROSTATIC FIELDThe field of influence between two differently charged bodies [2]. | ||
ELECTROSTATIC METER MOVEMENTA meter movement that uses the electrostatic repulsion of two sets of charged plates (one fixed and the other movable). This meter movement reacts to voltage rather than to current and is used to measure high voltage [3]. | ||
ELECTROSTATIC STRESSThe force exerted on an insulator by the voltage in a conductor [4]. | ||
ELEMENT(1) A substance, in chemistry, that cannot be divided into simpler substances by any means ordinarily available [1]. (2) A part of an antenna that can be either an active radiator or a parasitic radiator [10]. | ||
ELEPHANT TRUNKDucting used for ventilation purposes [4]. | ||
ELEVATION ANGLEThe angle between the horizontal plane and the line of sight to a target or object [11] [18]. | ||
EMERGENCY POWERTemporary source of limited electrical power used upon the loss of the normal power source [18]. | ||
EMF (ELECTROMOTIVE FORCE)The force that causes electricity to flow between two points with different electrical charges or when there is a difference of potential between the two points. The unit of measurement is volts [1]. | ||
EMITTERThe element in a transistor that emits current carriers (electrons or holes) [7] [13]. | ||
EMITTER-INJECTION MODULATORThe transistor equivalent of the cathode modulator. The gain is varied by changing the voltage on the emitter [12]. | ||
ENAMELA synthetic compound of cellulose acetate (wood pulp and magnesium). Used to insulate wire in meters, relays, and motor windings [4]. | ||
ENCAPSULATEDImbedded in solid material or enclosed in glass or metal [14]. | ||
END-FEED METHODA method in which one end of an antenna is connected through a capacitor to the final output stage of a transmitter [10]. | ||
END-FIRE ARRAYAn array in which the direction of radiation is parallel to the axis of the array [10]. | ||
ENERGYThe ability or capacity to do work [1]. | ||
Ep-Ip CURVEThe characteristic curve of an electron tube used to graphically depict the relationship between plate voltage (Ep) and plate current (Ip) [6]. | ||
EPHEMERISA table showing the precalculated position of a satellite at any given time [17]. | ||
EPITAXIAL PROCESSA method of depositing a thin, uniformly doped crystalline region (layer) on a substrate [14]. | ||
EQUATORIAL ORBITAn orbit that occurs when the plane of a satellite coincides with the plane of the earth at the equator [17]. | ||
EQUIVALENT RESISTANCEA resistance that represents the total ohmic values of a circuit component or group of circuit components. Usually drawn as a single resistor in a simplified circuit [1]. | ||
ERECTINGThe positioning of a gyro into a desired position and the maintaining of that position [15]. | ||
ERROR DETECTORThe component in a servosystem that determines when the load has deviated from its ordered position, velocity, and so forth [15]. | ||
ERROR REDUCERThe name commonly given to the servomotor in a servosystem. So named because it reduces the error signal by providing feedback to the error detector [15]. | ||
ERROR SIGNAL(1) In servosystems, the signal whose amplitude and polarity or phase are used to correct the alignment between the controlling and the controlled elements. (2) The name given to the electrical output of a control transformer [15]. | ||
EUTECTIC ALLOYAn alloy that changes directly from a solid to a liquid with no plastic or semiliquid state [14]. | ||
EUTECTIC SOLDERAn alloy of 63 percent tin and 37 percent lead. Melts at 361o F [14]. | ||
EXCITATION VOLTAGEThe supply voltage required to activate a circuit [15]. | ||
EXCITING CURRENTThe current that flows in the primary winding of a transformer when the secondary is open-circuited; it produces a magnetic flux field. Also called magnetizing current [2]. | ||
EXCLUSIVE ORA function whose output is a 1 if one and only one of the input variables is a 1 [13]. | ||
EXCLUSIVE-OR GATEA gate that produces a logic 1 output when the inputs are different, but not when they are the same [13]. | ||
EXPONENTThe numeral written in superscript (102) which indicates the power to which the base is to be raised [13]. | ||
EXPRESSIONA validated series of variables, constants, and functions that can be connected by operating symbols to describe a desired computation [13]. | ||
EXTERNALLY EXCITED METERA term used to describe meters that get their power from the circuit to which they are connected [16]. | ||
EXTERNALLY SYNCHRONIZED RADARA radar system in which timing pulses are generated by a master oscillator external to the transmitter [18]. | ||
EXTREMELY HIGH FREQUENCYThe band of frequencies from 30 gigahertz to 300 gigahertz [17]. | ||
EXTREMELY LOW FREQUENCYThe band of frequencies up to 300 hertz [17]. | ||
EXTRINSICA semiconductor in which impurities have been added to create certain charge carrier concentrations [7]. | ||