Electric Lighting: A Practical Exposition of the Art, for the Use of Engineers, Students, and Others Interested in the Installation Or Operation of Electrical Plants, Том 2D. Van Nostrand Company, 1901 |
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Сторінка 5
... means of the ordinary screw micrometer . tance . A very simple and convenient rule to remember is the fact that 1,000 feet of No. 10 A. W. G. wire , which is practically one- tenth of an inch in diameter ( .1019 ) , has 1 ohm resistance ...
... means of the ordinary screw micrometer . tance . A very simple and convenient rule to remember is the fact that 1,000 feet of No. 10 A. W. G. wire , which is practically one- tenth of an inch in diameter ( .1019 ) , has 1 ohm resistance ...
Сторінка 10
... means insignificant . Bars of this size or larger are often used in practice carrying correspondingly heavy currents ; hence it is not safe to ignore resistance , even in the case of very large conductors . Loss of Energy . The second ...
... means insignificant . Bars of this size or larger are often used in practice carrying correspondingly heavy currents ; hence it is not safe to ignore resistance , even in the case of very large conductors . Loss of Energy . The second ...
Сторінка 13
... means of some form of Kelvin's Law ; then this re- sult should be carefully checked by assuming a larger and also a smaller wire , and estimating the economy that would be secured if they were substituted for the size of wire obtained ...
... means of some form of Kelvin's Law ; then this re- sult should be carefully checked by assuming a larger and also a smaller wire , and estimating the economy that would be secured if they were substituted for the size of wire obtained ...
Сторінка 25
... means of a magnet connected across as a shunt between the leads of the lamp . The coils of this magnet are of high resistance , and carry little current until the filament is broken , when the full current is thrown . through them ...
... means of a magnet connected across as a shunt between the leads of the lamp . The coils of this magnet are of high resistance , and carry little current until the filament is broken , when the full current is thrown . through them ...
Сторінка 53
... means of the ordinary rheostat in the shunt field circuit , being either in- structed to do so , or naturally falling into that habit . It would greatly improve the service , however , if the pressure were kept at a given value for any ...
... means of the ordinary rheostat in the shunt field circuit , being either in- structed to do so , or naturally falling into that habit . It would greatly improve the service , however , if the pressure were kept at a given value for any ...
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Electric Lighting: A Practical Exposition of the Art, for the Use of ... Francis Bacon Crocker Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
alternating current amperes apparatus arc lamps armature arrangement bulb bus bars cable candle-power capacity carbon cent circular mils conductors conduit connected constant current constant potential copper loss core cross-arm cross-section cut-out device diameter difference direct current distribution drop dynamo effect efficiency electric lighting electrical conductors employed energy equal fact feeders feeding-points filament flow frequency full load fuse globe ground heat hence incandescent lamps inch inclosed arc increase inductance insulation iron joint latter length less machines magnetic maximum mechanical metal meter method motor number of lamps ohms one-half open arc operation ordinary parallel phase pipe placed pole polyphase porcelain practically pressure primary produced reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit shown in Fig shunt side single-phase socket supplied switch temperature terminal three-phase three-wire system tion transformers tube two-phase two-wire two-wire circuit usually voltage volts wattmeter watts winding
Популярні уривки
Сторінка 460 - The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Сторінка 11 - W, we find that the most economical area of conductor is that for which the annual cost of energy wasted is equal to the annual interest on that portion of the capital outlay which can be considered to be proportional to the weight of metal used. Professor George Forbes, in his Cantor Lecture, on " The Distribution of Electricity...
Сторінка 459 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.