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 3
... one - half that of copper , and its density is 2.7 . 2.7 1.0 Hence , an aluminum wire weighs only X 8.89 0.5 = 0.607 , or a little more than one - half as much as a copper wire having the same length and resistance . Metallic sodium is ...
... one - half that of copper , and its density is 2.7 . 2.7 1.0 Hence , an aluminum wire weighs only X 8.89 0.5 = 0.607 , or a little more than one - half as much as a copper wire having the same length and resistance . Metallic sodium is ...
Сторінка 5
... one - half the resis- A wire three sizes smaller , that is , No. 13 , has one - half the cross - section and weight , and twice the resistance per thousand feet . Three sizes smaller than No. 13 , that is , No. 16 , has one- fourth the ...
... one - half the resis- A wire three sizes smaller , that is , No. 13 , has one - half the cross - section and weight , and twice the resistance per thousand feet . Three sizes smaller than No. 13 , that is , No. 16 , has one- fourth the ...
Сторінка 8
... half a unit , representing an arithmetical degree of accuracy of at least one part in two thousand . The diameters of the B. & S. or A. W. G. wires are obtained from the geometrical series in which No. 0000 = 0.4600 inch and No. 36 ...
... half a unit , representing an arithmetical degree of accuracy of at least one part in two thousand . The diameters of the B. & S. or A. W. G. wires are obtained from the geometrical series in which No. 0000 = 0.4600 inch and No. 36 ...
Сторінка 20
... one - half as great as in the first case . If the ground connection has a resistance of 8,000 ohms , the current through the body would 900 be of an ampere , which is not dangerous . 8,000+ 1,000 1 10 We may sum up these various cases ...
... one - half as great as in the first case . If the ground connection has a resistance of 8,000 ohms , the current through the body would 900 be of an ampere , which is not dangerous . 8,000+ 1,000 1 10 We may sum up these various cases ...
Сторінка 21
... one connected with the ground and touching the wire at some other point . 4. It is never safe , however , to assume ... one - half the loss of energy , the cross- * For a description of such machines see Vol . I. , P. 330 . section and ...
... one connected with the ground and touching the wire at some other point . 4. It is never safe , however , to assume ... one - half the loss of energy , the cross- * For a description of such machines see Vol . I. , P. 330 . section and ...
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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.