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 17
... varies with number of lamps . Direct Current . II . Two - wire incandescent and arc lighting ( about 110 or 220 volts ) . 12. Three - wire incandescent and arc lighting ( about 220 or 440 volts ) . 13. Five - wire incandescent and arc ...
... varies with number of lamps . Direct Current . II . Two - wire incandescent and arc lighting ( about 110 or 220 volts ) . 12. Three - wire incandescent and arc lighting ( about 220 or 440 volts ) . 13. Five - wire incandescent and arc ...
Сторінка 24
... varies in direct pro- portion , so that two - thirds of the lamps on one loop would require a P.D. of 4,000 volts between the brushes to which it is connected . This gives great flexibility to the system , and provided the lamps are not ...
... varies in direct pro- portion , so that two - thirds of the lamps on one loop would require a P.D. of 4,000 volts between the brushes to which it is connected . This gives great flexibility to the system , and provided the lamps are not ...
Сторінка 31
... varies from point to point , this being the usual condition in parallel distribution . If Fig . 13 be modified in such a way that the size of each section of the main is proportional to the current passing through it , Fig . 15 is ...
... varies from point to point , this being the usual condition in parallel distribution . If Fig . 13 be modified in such a way that the size of each section of the main is proportional to the current passing through it , Fig . 15 is ...
Сторінка 78
... varies slowly , and is therefore unimpeded by the self - induction . It is evident that the ohmic resistance of D should be as low and its self - induction as high as possible , in order that the loss of energy and the difference in ...
... varies slowly , and is therefore unimpeded by the self - induction . It is evident that the ohmic resistance of D should be as low and its self - induction as high as possible , in order that the loss of energy and the difference in ...
Сторінка 91
... varies , so that it would be very difficult to calcu- late the current that each group would take . In practice conduc- tors are designed to supply a given current at a certain point ; and slight variations in current due to changes in ...
... varies , so that it would be very difficult to calcu- late the current that each group would take . In practice conduc- tors are designed to supply a given current at a certain point ; and slight variations in current due to changes in ...
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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.