Saturday, 4 May 2024, 3:53 AM
Site: edulabs.org academy
Course: Activity Examples (Activity Examples)
Glossary: Electronics (Mike Jaroch)
V
V ANTENNAA bidirectional antenna, shaped like a V, which is widely used for communications [10]. |
VACUUM EVAPORATIONProcess of producing thin film components [14]. |
VALENCEThe measure of the extent to which an atom is able to combine directly with other atoms. It generally depends on the number and arrangement of the electrons in the outermost shell of the atom [1]. |
VALENCE SHELLThe electrons that form the outermost shell of an atom [1]. |
VARAbbreviation for volt-amperes reactive [2]. |
VARACTORA PN junction semiconductor, designed for microwave frequencies, in which the capacitance varies with the applied voltage [7] [11] [12]. |
VARACTOR FM MODULATORAn FM modulator that uses a voltage-variable capacitor (varactor) [12]. |
VARIABLEA representative symbol that can assume any of a given set of values [13]. |
VARIABLE ATTENUATORAn attenuator for reducing the strength of an ac signal either continuously or in steps, without causing signal distortion [11]. |
VARIABLE RESISTORA wire-wound or composition resistor, the value of which may be changed over a designed range [1]. |
VARIABLE-MU-TUBESame as REMOTE-CUTOFF TUBE [6]. |
VARNISHED CAMBRICCotton cloth coated with insulation varnish. An insulation used on high- voltage conductors [4]. |
VECTORA line used to represent both direction and magnitude [2] [12]. |
VEITCH DIAGRAMA diagram consisting of joined squares, which is used to give a graphic representation of basic logic relations [13]. |
VELOCITYThe rate at which a disturbance travels through a medium [10]. |
VELOCITY MODULATIONModification of the velocity of an electron beam by the alternate acceleration and deceleration of electrons [11]. |
VELOCITY SERVOSYSTEMA servosystem which controls the speed of the load it is driving [15]. |
VERTICAL AXISOn a graph, the straight line axis that is plotted from bottom to top [10]. |
VERTICAL DEFLECTION PLATESA pair of parallel electrodes in a CRT that moves the electron beam up and down [6]. |
VERTICAL PATTERNThe part of a radiation pattern that is radiated in the vertical plane [10]. |
VERTICAL PLANEAn imaginary plane that is perpendicular to the horizontal plane [11] [18]. |
VERTICALLY POLARIZEDWaves that are radiated with the E field component perpendicular to the earth's surface [10]. |
VERY HIGH FREQUENCYThe band of frequencies from 30 megahertz to 300 megahertz [17]. |
VERY LARGE SCALE INTEGRATIONAn integrated circuit containing over 2,000 logic gates or 64,000 bits of memory [14]. |
VERY LOW FREQUENCYThe band of frequencies from 3 kilohertz to 30 kilohertz [17]. |
VIDEO AMPLIFIERAn amplifier designed to amplify the entire band of frequencies from 10 hertz (10 Hz) to 6 megahertz (6 MHz). Also called a WIDE-BAND AMPLIFIER [8]. |
VIDEO ENHANCEMENT FEATURESSee ANTIJAMMING CIRCUITS [18]. |
VINCULAPlural of vinculum (see below) [13]. |
VINCULUMA straight horizontal line placed over one or more members of a compound logic expression to negate or complement. Also, used to join two or more members together [13]. |
VIRTUAL GROUNDA point in a circuit that is at ground potential (0 V) but is not connected to ground [8]. |
VOLTThe unit of electromotive force or electrical pressure. One volt is the pressure required to send 1 ampere of current through a resistance of 1 ohm [1]. |
VOLTAGE(1) The term used to signify electrical pressure. Voltage is a force that causes current to flow through an electrical conductor. (2) The voltage of a circuit is the greatest effective difference of potential between any two conductors of the circuit [1]. |
VOLTAGE AMPLIFIERAn amplifier in which the output-signal voltage is greater than the input-signal voltage [8]. |
VOLTAGE DIVIDERA series network in which desired portions of the source voltage may be tapped off for use in the circuit [1]. |
VOLTAGE DROPThe difference in voltage between two points. It is the result of the loss of electrical pressure as a current flows through a resistance [1] [4]. |
VOLTAGE GAINThe ratio of output voltage to input voltage in an amplifier [6]. |
VOLTAGE MULTIPLIERSMethods of increasing voltages; used primarily where low current is required [7]. |
VOLTAGE REGULATIONA measure of the ability of a generator or power supply to maintain a constant output voltage from no-load to full-load operation. Expressed as a percentage of full-load voltage; the better the regulation, the lower the percent [5]. |
VOLTAGE-DIODE DETECTORA series-diode detector in which the diode is in series with the input voltage and the load impedance [12]. |
VOLTAGE-FEED METHODSame as END-FEED METHOD [10]. |
VOLTMETERA meter used to measure voltage [3] [16]. |
VSWR(VSWR)—In a waveguide, the ratio of the electric field (voltage) at a maximum point to that of an adjacent minimum point [10] [18]. |