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Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

lateral
(1) a lateral on a primary distribution line is a short tap from the main distribution line which serves a local set of loads. Single phase laterals are common in residential districts.

(2) a three-phase or single-phase power line which supplies the distribution transformers along a street
See feeder
leader
an elongated region of ionized gas that extends from one electrode to another just before a high-voltage breakdown.
leakage
the flux in a magnetic circuit that does not do any useful work.
leakage flux
the flux that does not link all the turns of a winding or in coupled circuits, flux that links one winding but not another. For example, the magnetic flux produced by the primary winding of a transformer that is not coupled to the secondary winding.
leakage reactance
the amount of inductive reactance associated with leakage flux. The leakage flux is the flux which traverses in paths farther from the designated paths such as the magnetic core in transformers and the air gap in electric machines and constitutes the non-useful flux. The electric circuit symbol of leakage reactance is Xl . It is a function of the leakage inductance and the frequency of operation. Higher values of leakage reactance affect the regulation and efficiency of the system. Xl is expressed in ohms.
LED
See light emitting diode
left-hand circular polarization
the state of an electromagnetic wave in which the electric field vector rotates anticlockwise when viewed in the direction of propagation of the wave.
light emitting diode (LED)
a forward-biased p-n junction that emits light through spontaneous emission by a phenomenon termed electroluminescence.
light loss factor (LLF)
the ratio of the illumination when it reaches its lowest level at the task just before corrective action is taken, to the initial level if none of the contributing loss factors were considered.
light scattering
(1) spreading of the light as it passes or is reflected by an optically inhomogeneous medium.

(2) the process in which a beam of light interacts with a material system and becomes modified in its frequency, polarization, direction of propagation, or other physical property. See also spontaneous light scattering, stimulated light scattering, Brillouin scattering, Raman scattering. light valve See spatial light modulator.
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