- Laminated core
Core made up of sheets of magnetic
material insulated from one another by an oxide or varnish.
- Lamp
Device that produces light.
- Laser
Device that produces a very narrow
intense beam of light. The name is an axcronym for "light amplification by
stimulated emission of radiation.
- Lead
The angle by which one alternating
signal leads another in time. Opposite of lag. Also a wire that connects
two points in a circuit.
- Lag
-
Difference in time between two
waveforms of the same frequency expressed in degrees. Example: One
waveform lags another waveform by a certain number of degrees.
- Lead-acid cell
Cell made up of lead plates
immersed in a sulphuric acid electrolyte. An automobile battery usually
consists of six lead-acid cells.
- Leakage
-
Small undesirable flow of current
through an insulator or dielectric.
- LED
Abbreviation for "light emitting
diode."
- Left-hand-rule
-
If fingers of the left hand are
placed around a wire so that the thumb points in the direction of electron
flow, the fingers will be pointing in the direction of the magnetic field
being produced by the conductor.
- Lenz's law
The current induced in a circuit
due to a change in the magnetic field is so directed as to oppose the
flux, or to exert a mechanical force to oppose the motion.
- Level detector
-
An op-amp circuit that compares two
inputs and provides a DC output indicating the polarity relationship
between the inputs. A comparitor.
- Lie detector
Piece of electronic equipment also
called a polygraph used to determine whether a person is telling the truth
by looking for dramatic changes in blood pressure, body temperature,
breathing rate, heart rate and skin moisture in response to questions.
- Light
Electromagnetic radiation in a band
of frequencies that can be received by the human eye.
- Lifetime
The time from the creation of an
electron hole pair until recombination occurs.
- Light-emitting diode
A semiconductor diode that converts
electric energy into electromagnetic radiation at a visible and near
infrared frequencies when its pn junction is forward biased.
- Limiter
-
Circuit or device that prevents
some portion of its input from reaching the output. A clipper.
- Linear
Relationship between input and
output in which the output varies in direct proportion to the input.
- Linear scale
A scale in which the divisions are
uniformly spaced.
- Line regulation
-
The ability of a voltage regulator
to maintain a constant voltage when the regulator input voltage varies.
- Live
-
Term used to describe a circuit or
piece of equipment that is on and has current flow within it.
- Load
A source drives a load. Whatever
component or piece of equipment is connected to a source and draws current
from a source is a load on that source.
- Load current
Current drawn from a source by a
load.
- Load impedance
Vector sum of reactance and
resistance in a load.
- Loading effect
-
Large load impedance will draw a
small load current and so loading of the source is small. (light load). A
small load impedance will draw a large load current from the source.
(heavy load).
- Load regulation
The ability of a voltage regulator
to maintain a constant output voltage under varying load currents.
- Load resistance
Resistance of a load.
- Logic
Science of dealing with the
principle and applications of gates, relays and switches.
- Loss
Term used to describe a decrease in
power.
- Low pass
-
A tuned circuit designed to pass
all frequencies below a designated cut-off frequency
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