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Load
The weight supported by a structure.
Load Bearing
Supporting a superimposed weight or force.
Load Carrying Capability
The maximum recommended payload that does not degrade the listed specifications for a mechanical stage.
Load Isolator
A passive attenuator in which the loss in one direction is much greater than that in the opposite direction.
Load Transfer
The dynamic transferring of vertical load from one tyre to another on a vehicle.
Load-Deflection Diagram
Plot of load versus corresponding deflection.
Loading Effect
The effect of a voltmeter upon the circuit being measured that results in an inaccurate measurement.
Lobe
An area of greater signal strength in the transmission pattern of an antenna.
Local Action
A continuation of current flow within a battery cell when there is no external load.
Local Area Network
A network of computers connected together, usually in a single department or building.
Local Stress Relieving
Stress relieving heat treatment of a specific portion of a structure.
Local Time
Time based upon the local meridian as reference, as contrasted with that based upon a zone meridian, or the meridian of Greenwich.
Localization Accuracy
Our ability to detect changes in localization or lateralization is not absolute.
Lock
A mechanical device that is used on a door or container to restrict access.
Lock and Key Model
A model that explains the role of enzymes in chemical reactions by assuming that the reactants fit into the enzyme like a key fits into a lock.
Lock Nut
This can be either a second nut that is tightened against the first nut or a nut that has some form of system that prevents the nut from coming loose with vibration, eg Cleveloc or Nyloc.
Locked Rotor Current
Steady state current taken from the line with the rotor at standstill.
Locked Rotor Torque
The minimum torque that a motor will develop at rest for all angular positions of the rotor.
Locking Pliers
A type of pliers with locking jaws that can be used as pliers, wrench, clamp, or small vice.
Lockup Torque Converter
A torque converter fitted with a lockup clutch that can be engaged to eliminate the slip between the torque converter′s input and output.
Locus
The set of all points meeting some specified condition.
log
Abbreviation of Logarithm.
Logarithm
The power to which a base must be raised to yield a given number.
Logarithm of Complex Numbers
A complex number expressed in logarithmic form.
Logarithmic Receiver
Receiver that uses a linear logarithmic amplifier instead of a normal linear amplifier.
Logic
The study of the formal laws of reasoning.
Logic Circuit
The primary control information processor in digital equipment; made up of electronic gates and so named because their operation is described by simple equations of a specialized logic algebra.
Logic Diagram
Representing the logical elements and their interconnections without necessarily expressing construction or engineering details.
Logic Instruction
Any instruction that executes a logic operation that is defined in symbolic logic, such as AND, OR, NAND, or NOR.
Logic Operation
A nonarithmetical operation in a computer, such as comparing, selecting, making references, matching, sorting, and merging, where the logical YES or NO quantities are involved.
Logic Switch
A diode matrix or other switching arrangement that is capable of directing an input signal to one of several outputs.
Logic Symbol
A symbol used to represent a logic element graphically.
Logistic Equation
A classical starting point for the dynamics of quasiperiodic and chaotic systems.
LOHC
Abbreviation of Liquid Organic Hydrogen Carriers.
Lombard Effect
As noise levels increase, talkers increase their voice levels to compensate and to maintain adequate conditions for verbal communication.
London Force
An intermolecular attractive force that arises from a cooperative oscillation of electron clouds on a collection of molecules at close range.
Lone Pair
Electrons that are not involved in bonding.
Long Hundredweight
The British hundredweight, equal to 112 pounds.
Long Nose Pliers
Pliers with half round and tapered jaws.
Long Ton
The traditional British ton, equal to 2240 pounds.
Long Wire Antenna
An antenna that is a wavelength or more long at its operating frequency.
Longitude
The location of a point east or west of the prime meridian. Longitude is shown on a map or globe as north-south lines left and right of the prime meridian, which passes through Greenwich, England.
Longitudinal Engine
An engine layout in a vehicle where the axis of the crankshaft lays along the fore-aft or longitudinal axis of the vehicle.
Longitudinal Wave
A wave in which the vibrations of the medium are parallel to the direction the wave is moving.
Lookup Table
A table in computer memory that is used to convert a value into a related value from the table.
Loop
In a program, a series of instructions that are repeated a prescribed number of times, followed by an end instruction to terminate the series.
Loop Scavenged Engine
An external blower is used to supply the charge, under some pressure, at the inlet manifold.
Loose Coupling
Inefficient coupling of energy from one circuit to another that is desirable in some applications.
Loose Joint Hinge
A hinge having only two knuckles, to one of which the pin is fastened permanently.
Loose Pin Hinge
Hinge having a removable pin to permit the two leaves of the hinge to be separated.
Lorentz Force
The force on a charged particle moving in a magnetic field.
Lorentz Gas
A Plasma model in which the electrons are assumed not to interact with each other, but only with ions and where the ions are assumed to remain at rest.
Lorentz Transformation
A set of equations which are used, in relativity problems, to transform measurements from one frame of reference to another.
Lorenz, Edward Norton
American mathematician and meteorologist, and a pioneer of chaos theory.
Lossy Medium
A medium which absorbs or scatters radiation passing through it.
Lost Foam Casting
A casting method using foamed plastic cores, giving the surface of the castings the appearance of styrofoam.
Lost Motion
Motion between a driving part and a driven part which does not move the driven part.
Lost Wax
Also known as investment or precision casting, it is based on the use of a mould that is only used once.
Loudness
A subjective term for the sensation of the magnitude of sound.
Loudness Level
Measured in phons it is numerically equal to the median sound pressure level (dB) of a free progressive 1000 Hz wave presented to listeners facing the source, which in a number of trials is judged by the listeners to be equally loud.
Loudspeaker
An electroacoustical transducer that changes electrical energy to acoustical energy.
Lovelace, Ada
The daughter of Lord Byron, who became the world′s first programmer while cooperating with Charles Babbage on the design of his mechanical computing engines in the mid-1800s.
Low Emission Vehicle
A level of standards for tailpipe emissions.
Low Frequency
The portion of the electromagnetic spectrum between 30 kHz and 300 kHz.
Low Frequency Noise
There is no international agreement on how exactly to define low frequency noise.
Low Frequency Sound
Acoustic waves below 20Hz are normally inaudible, but may be experienced as being in a region of high pressure.
Low Gear
The lowest gear in a transmission, usually called first gear.
Low Pass Filter
A filter with a characteristic that allows all frequencies below a specified rolloff frequency to pass and attenuate all frequencies above.
Low Spin Complex
A metal-ligand complex with fewer unpaired electrons than the uncomplexed metal ion.
Low Tension Leads
The wiring in the ignition system that is distinguished from the high tension wiring.
Low Voltage
AC system operating voltages from 120 to 600 VAC.
Lower control Arm
The lower suspension link between the steering knuckle and the frame. The arm pivots where it attaches at the frame to allow vertical movement of the steering knuckle.
Lower Frequency Cutoff
The lowest frequency a circuit will pass.
Lower Heating Value
The standard measure of the energy released during combustion of a fuel, assuming the product water is in the gaseous state.
Lower Quartile
The 25th percentile, calculated by ordering the data from smallest to largest and finding the value which lies 25% of the way up through the data.
Lower Sideband
All difference frequencies below that of the carrier.
Lowest Common Denominator
The smallest number that is exactly divisible by each denominator of a set of fractions.
Lowest Terms
A fraction is said to be in lowest terms if its numerator and denominator have no common factor.
Low-Wing Monoplane
An aircraft which has its single wing mounted low on the fuselage.
lox
Liquid oxygen.
Loxodrome
On a sphere, a curve that cuts all parallels under the same angle.