| 单词 | dielectric |
| 释义 | dielectric A substance that is not a conductor of direct electric current, a dielectric is an insulator, rather than a conductor. A dielectric permits the passage of the lines of force associated with an electromagnetic field, but does not conduct the current. As dielectrics, however, can sustain an electromagnetic field, they are commonly used in capacitors and between wires in a cable. Dielectrics include rubber, gutta percha, wood pulp, polyethylene, polyvinyl chloride, flouropolymer resin, and Teflon®, all of which have been used at various times as insulation in telecommunications cable and wire applications.The dielectric properties of plastic and glass make them ideal optical conductors in fiber optic cables, which are immune from 74570c04.qxd 9/11/07 12:19 PM Page 134 |
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