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 4
... distribution the most im- portant factor is resistance , from the scientific as well as from the commercial points of view . It entirely determines the flow of a direct current , and largely affects alternating - current circuits also ...
... distribution the most im- portant factor is resistance , from the scientific as well as from the commercial points of view . It entirely determines the flow of a direct current , and largely affects alternating - current circuits also ...
Сторінка 7
... distribution . At 60 ° C. , which is the usual heating limit allowed in electrical machin- ery , the results obtained from Equation 6 are three - quarters of one per cent less than those of Matthiessen . This expression is therefore ...
... distribution . At 60 ° C. , which is the usual heating limit allowed in electrical machin- ery , the results obtained from Equation 6 are three - quarters of one per cent less than those of Matthiessen . This expression is therefore ...
Сторінка 9
... distribution , and is very easily and defi- nitely determined from Ohm's law by changing its ordinary form I ER into E = IR . = This is not only true of the whole cir- cuit , but also applies to any portion or branch of the circuit ...
... distribution , and is very easily and defi- nitely determined from Ohm's law by changing its ordinary form I ER into E = IR . = This is not only true of the whole cir- cuit , but also applies to any portion or branch of the circuit ...
Сторінка 10
... distribution is the loss of energy which it occasions . This loss is absolute , and must always occur whenever a current flows through a resistance . The exact value of this loss is given by the expressions : Watts lost = E2 : 12 R ...
... distribution is the loss of energy which it occasions . This loss is absolute , and must always occur whenever a current flows through a resistance . The exact value of this loss is given by the expressions : Watts lost = E2 : 12 R ...
Сторінка 11
... Distribution , London , 1893 , p . 115 . § Electrical Transmission of Energy , N. Y. , 1895 , p . 457 . V = the pressure at the receiving end of the ELECTRICAL DISTRIBUTION : 11.
... Distribution , London , 1893 , p . 115 . § Electrical Transmission of Energy , N. Y. , 1895 , p . 457 . V = the pressure at the receiving end of the ELECTRICAL DISTRIBUTION : 11.
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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
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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.