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GLOSSARY OF TERMS | I-R |
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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. |
