Neets Master Glossary

1-39 LC CHOKE-INPUT FILTER—This filter is used in power supplies where voltage regulation is important and where the output current is relatively high and subject to varying load conditions [7]. LEAD—The opposite of lag. Also a WIRE or CONNECTION [2]. LEAD-ACID CELL—A cell in an ordinary storage battery in which electrodes are grids of lead containing an active material consisting of certain lead oxides that change in composition during charging and discharging. The electrodes or plates are immersed in an electrolyte of diluted sulfuric acid [1]. LEAD INDUCTANCE—The inductance of the lead wires connecting the internal components of an electron tube [11]. LEAD SHEATH—A continuous jacket of lead molded around a single conductor or multiple conductor cable. Generally used to ensure conductors are protected from water or extensive moisture [4]. LEAKAGE CURRENT—The small amount of current that flows through the dielectric between the conductors of a transmission line [10]. LEAKAGE FLUX—Magnetic flux lines produced by the primary winding that do not link the turns of the secondary winding [2]. LEAKAGE RESISTANCE—The electrical resistance that opposes the flow of current through the dielectric of a capacitor. The higher the leakage resistance, the slower the capacitor discharges or leaks across the dielectric [2]. LEAST SIGNIFICANT DIGIT (LSD)—The LSD is the digit whose position within a given number expression has the least weighting power [13]. LEFT-HAND RULE FOR GENERATORS—A rule or procedure used to determine the direction of current flow in a generator [2] [5]. LENZ'S LAW—The current induced in a circuit, caused by its motion in a magnetic field or a change in it's magnetic flux, in such a direction as to exert a mechanical force opposing the motion or to oppose the change in flux [2]. LIGHT-EMITTING DIODE (LED)—A PN-junction diode that emits visible light when it is forward biased. Depending on the material used to make the diode, the light may be red, green, or amber [7]. LIGHTHOUSE TUBE—An electron tube shaped like a lighthouse that is designed to handle large amounts of power at uhf frequencies [6]. LIGHT RAYS—Light waves emitting from a source in straight lines [10]. LIMITER—A device that prevents (limits) a waveform from exceeding a specified value [9]. LINEAR—Having an output that varies in direct proportion to the input [6]. LINEAR IMPEDANCE—An impedance in which a change in current through a device changes in direct proportion to the voltage applied to the device [12]. LINE OF FORCE—A line in an electric or magnetic field that shows the direction of the force [1]. LINE OF SIGHT—Straight line from a radar antenna to a target [18].