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SIC 3675 Electronic Capacitors
Encyclopedia entry from: Encyclopedia of American Industries
...and typically consists of two metal plates separated by an insulator, called a dielectric. Capacitance is directly proportional to the area of the plates and the dielectric constant of the insulator and is inversely proportional to the distance between the...
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semiconductor
Book article from: The Columbia Encyclopedia, Sixth Edition
...temperature is between that of a conductor and that of an insulator (see conduction ; insulation ). At high temperatures its...approaches that of a metal, and at low temperatures it acts as an insulator. In a semiconductor there is a limited movement of electrons...
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Electric Conductor
Encyclopedia entry from: The Gale Encyclopedia of Science
...the dissolved salts can carry current. Pure water is a good insulator, and various salts are fair conductors; together, as sea...which charges can move with no resistance, while in a perfect insulator it is impossible for charges to move at all. However, all...
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Capacitance
Encyclopedia entry from: The Gale Encyclopedia of Science
...capacity of a system of conducting surfaces separated by an insulator to store electrical charge. A device designed to have capacitance...appears to have electric charge on its surfaces even though the insulator remains electrically neutral. Each of the dielectric...
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SIC 2298 Cordage and Twine
Encyclopedia entry from: Encyclopedia of American Industries
...fiber cable, camouflage nets not made in weaving mills, cargo nets, braided cord, fish nets and seines, fishing lines, insulator pads, rope nets, rope, rope slings, and wire ropes. NAICS Code(s) 314991 (Rope, Cordage and Twine Mills) In the...
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SIC 3275 Gypsum Products
Encyclopedia entry from: Encyclopedia of American Industries
...construction material for interior walls because it is inexpensive, easy to install, fire retardant, and acts as a noise insulator. The United States remains the world's largest producer and consumer of wallboard. About 75 percent of the gypsum consumed...
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television
Book article from: The Columbia Encyclopedia, Sixth Edition
...orthicon and image-orthicon camera tubes improved on the iconoscope. They used light-sensitive granules deposited on an insulator and low-velocity scanning. These could be used with lower light levels than required by the iconoscope, and did not require...
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rubber
Book article from: The Columbia Encyclopedia, Sixth Edition
...electrical resistance make it useful as an adhesive, a coating composition, a fiber, a molding compound, and an electrical insulator. In general, synthetic rubber has the following advantages over natural rubber: better aging and weathering, more resistance...
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insulation
Book article from: The Columbia Encyclopedia, Sixth Edition
...insulated at every point of contact with its supports to prevent escape, or leakage, of the current. Dry air is a good insulator, or dielectric , so that conductors used for electric-power transmission require insulating material only at their points...
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Electrical Conductivity
Encyclopedia entry from: UXL Encyclopedia of Science
...be found in insulators. Those electrons tend to be bound tightly to nuclei in chemical bonds. Attaching a battery to an insulator has no effect since there are no free electrons to be pushed through the material. Solution conductivity Electrons are not...
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