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 1
... length and cross - section of wires or conductors . * The for- mer system , in spite of its many advantages , is rarely used for this purpose in America or in England ; and tables or rules employing it would be practically worthless at ...
... length and cross - section of wires or conductors . * The for- mer system , in spite of its many advantages , is rarely used for this purpose in America or in England ; and tables or rules employing it would be practically worthless at ...
Сторінка 3
... length and resistance . Metallic sodium is only about one - quarter as heavy as copper for equal length and resistance . Although there are several metals that could be used as elec- trical conductors which are considerably lighter than ...
... length and resistance . Metallic sodium is only about one - quarter as heavy as copper for equal length and resistance . Although there are several metals that could be used as elec- trical conductors which are considerably lighter than ...
Сторінка 5
... length of the wire in feet , and d its diameter in mils . The latter is easily deter- mined with accuracy by means of the ordinary screw micrometer . A very simple and convenient rule to remember is the fact . that 1,000 feet of No. 10 ...
... length of the wire in feet , and d its diameter in mils . The latter is easily deter- mined with accuracy by means of the ordinary screw micrometer . A very simple and convenient rule to remember is the fact . that 1,000 feet of No. 10 ...
Сторінка 8
... LENGTH . FEET PER ОHм . 12 .08081 6,530 .01977 12.47 11.16 10.07 50.59 630.7 564.5 509.4 .08022 .08962 .09932 13 .07196 5,178 .01568 7.840 7.017 6.332 63.79 500.1 447.7 404.0 .1276 .1425 1579 14 .06408 4,107 .01243 4.931 4.413 3.982 ...
... LENGTH . FEET PER ОHм . 12 .08081 6,530 .01977 12.47 11.16 10.07 50.59 630.7 564.5 509.4 .08022 .08962 .09932 13 .07196 5,178 .01568 7.840 7.017 6.332 63.79 500.1 447.7 404.0 .1276 .1425 1579 14 .06408 4,107 .01243 4.931 4.413 3.982 ...
Сторінка 9
... lengths , in each of which we can determine the current , the resistance , and therefore the fall of potential which takes place . In most practical work the current in amperes is given , since it is usually known how many lamps or how ...
... lengths , in each of which we can determine the current , the resistance , and therefore the fall of potential which takes place . In most practical work the current in amperes is given , since it is usually known how many lamps or how ...
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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 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 operation ordinary parallel phase pipe placed pole polyphase polyphase systems porcelain practically pressure primary produced reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit secondary coils 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.