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 9
... amperes is given , since it is usually known how many lamps or how much power are to be supplied . It then becomes necessary to calculate the value of the resistance in order to have the proper value for the drop , the latter being ...
... amperes is given , since it is usually known how many lamps or how much power are to be supplied . It then becomes necessary to calculate the value of the resistance in order to have the proper value for the drop , the latter being ...
Сторінка 10
... amperes , R is the resistance in ohms , and E is the drop or lost pressure in volts , being applicable either to the whole circuit or to any part of it . From one of these ex- pressions the loss of energy can always be ascertained ...
... amperes , R is the resistance in ohms , and E is the drop or lost pressure in volts , being applicable either to the whole circuit or to any part of it . From one of these ex- pressions the loss of energy can always be ascertained ...
Сторінка 14
... amperes per square inch of cross section . Professor George Forbes discussed this problem in a paper read before the Institution of Electrical Engineers ( London ) in March , 1884 , and showed that the Board of Trade rule was hardly ...
... amperes per square inch of cross section . Professor George Forbes discussed this problem in a paper read before the Institution of Electrical Engineers ( London ) in March , 1884 , and showed that the Board of Trade rule was hardly ...
Сторінка 15
... AMPERES . AMPERES . AMPERES . CIRCULAR MILLS . AMPERES . AMPERES . 18 3 3 5 200,000 200 300 16 5 6 8 300,000 270 400 14 10 12 16 400,000 330 500 12 15 17 23 500,000 390 590 10 20 24 32 600,000 450 680 8 25 33 46 700,000 500 760 6 35 46 ...
... AMPERES . AMPERES . AMPERES . CIRCULAR MILLS . AMPERES . AMPERES . 18 3 3 5 200,000 200 300 16 5 6 8 300,000 270 400 14 10 12 16 400,000 330 500 12 15 17 23 500,000 390 590 10 20 24 32 600,000 450 680 8 25 33 46 700,000 500 760 6 35 46 ...
Сторінка 17
... amperes and 50 volts per lamp . 2. Series incandescent lighting . About 10 amperes and 10 to 30 volts per lamp ( about 3 candle- power per volt ) . 3. Series incandescent lighting ( " Municipal systems " ) . Three to 3.5 amperes and 20 ...
... amperes and 50 volts per lamp . 2. Series incandescent lighting . About 10 amperes and 10 to 30 volts per lamp ( about 3 candle- power per volt ) . 3. Series incandescent lighting ( " Municipal systems " ) . Three to 3.5 amperes and 20 ...
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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.