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 |
З цієї книги
Результати 6-10 із 72
Сторінка 30
... the same values , but is in the opposite direction , the fall of potential being always in the - * U. S. Patent , No. 264,642 , Sept. 19 , 1882 . direction in which the current flows . The distribution of 30 ELECTRIC LIGHTING .
... the same values , but is in the opposite direction , the fall of potential being always in the - * U. S. Patent , No. 264,642 , Sept. 19 , 1882 . direction in which the current flows . The distribution of 30 ELECTRIC LIGHTING .
Сторінка 31
... flows . The distribution of potential is shown in an exaggerated manner in Fig . 14. It will be seen that a potential of 111 volts , supplied at the feeding - points , gives 109 volts at the other end , therefore no lamp receives a ...
... flows . The distribution of potential is shown in an exaggerated manner in Fig . 14. It will be seen that a potential of 111 volts , supplied at the feeding - points , gives 109 volts at the other end , therefore no lamp receives a ...
Сторінка 42
... flows between the two mains in a uniform sheet throughout their entire length . Cylindrical Conductors . Parallel System ... flow of current per unit of length is I / L. E By Ohm's law the variation in potential in any conductor is = RI ...
... flows between the two mains in a uniform sheet throughout their entire length . Cylindrical Conductors . Parallel System ... flow of current per unit of length is I / L. E By Ohm's law the variation in potential in any conductor is = RI ...
Сторінка 49
... flows down- ward from the + feeding - point , then the current in the upper half of mains is I r , and their combined resistance is 2 R , hence , - -- V — V2 = 2 R ( I − x ) or RI – V – V1⁄2 - - 2 V1 = Rx , = Rx , 2 and V also V1 - V2 ...
... flows down- ward from the + feeding - point , then the current in the upper half of mains is I r , and their combined resistance is 2 R , hence , - -- V — V2 = 2 R ( I − x ) or RI – V – V1⁄2 - - 2 V1 = Rx , = Rx , 2 and V also V1 - V2 ...
Сторінка 50
... flows upward from the + feeding - point is 8 - 5 = 3 amperes , the current in each lamp being 4 amperes . Fig . 29 represents the distribution of potential in this case , including the drop in each portion of the mains . The addition 50 ...
... flows upward from the + feeding - point is 8 - 5 = 3 amperes , the current in each lamp being 4 amperes . Fig . 29 represents the distribution of potential in this case , including the drop in each portion of the mains . The addition 50 ...
Інші видання - Показати все
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.