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GLOSSARY OF TERMS | I-R
  A-B | C-D | E-H | I-R | S-Z
Impedance
The total opposition that a circuit offers to the flow of alternating current or any other vary current at a particular frequency. It is a combination of resistance R and reactance X, measured in ohms.
Inductance
The property of a circuit or circuit element that opposes a change in current flow, thus causing current changes to lag behind voltage changes. It is measured in henrys.
Insulation
A material having high resistance to the flow of electric current. Often called a dielectric in rado frequency cable.
Jacket
An outer non-metallic protective covering applied over an insulated wire or cable.
Jumper Cable
A short flat cable inter-connecting two wiring boards or devices.
 Lay
The length measured along the axis of a wire or cable required for a single strand (in stranded wire) or conductor (in cable) to make one complete turn about the axis of the conductor or cable.
Longitudinal Shield
A tape shield, flat or corrugated, applied longitudinally with the axis of the core being shielded.
L-N
An abbreviation for line-to-neutral, the location for the most common type of power surge (see Full Protection).
 MTW
Thermoplastic insulated machine tool wire.
Multiconductor
More than one conductor within a single cable complex.
 Mylar
A synthetic compound with high dielectric qualities made by Du-pont® and used extensively in the wire and cable industry.
Noise
A term for unwanted electrical signals on the power line.
Noise Filter
An electronic component, usually a capacitor, designed to minimize unwanted electrical signals.
Ohm
A unit of electrical resistance.
 Peak Current
Another term for energy capacity.
Picosecond
One trillionth of a second.
Plasticizer
A chemical agent added to plastics to make them softer and more pliable.
 Potting
The sealing of a cable termination or other component with a liquid that thermosets intos an elastomer.
 Primary Insulation
The first layer of non-conductive material applied over a conductor, whose prime function is to act as electrical insulation.
Put-Up
Packaging of finished wire or cable.
Rated Voltage
The maximum voltage at which an electrical component can operate for extended periods without undue degradation or safety hazard.
Resistance
A measure of the difficulty in moving electrical current through a medium when voltage is applied. It is measure in ohms.
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