| 单词 | wire |
| 释义 | wire A current-carrying metal conductor, generally encased in a dielectric insulating material. A solid core conductor comprises a single wire. A stranded conductor comprises a number (usually 7 or 17, because they pack neatly) of small wires.Telecommunications wires generally are made of copper to conduct electrical current, although tinned copper, copper-clad aluminum, and other metals and metal combinations also can be used. Stranded, rather than solid core, conductors are used in applications requiring high flex strength. The wires generally are separately insulated with polyethylene, polyvinyl chloride (PVC), flouropolymer resin,Teflon, or some other low-smoke, fire-retardant, dielectric material.Two wires then typically are twisted in a helix with a constant pitch or distance to make a 360-degree twist to form a twisted pair. One or more pairs then are formed into a cable, which is covered in a protective sheath of dielectric material. See also cable, conductor, current, dielectric, flex strength, insulation, and twisted pair. |
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