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 14
... difference between the heating effects under these various conditions . An insulated cable in water is the simplest case ; since the rise in temperature of the conductor depends merely upon the thermal resistance of the insulation , the ...
... difference between the heating effects under these various conditions . An insulated cable in water is the simplest case ; since the rise in temperature of the conductor depends merely upon the thermal resistance of the insulation , the ...
Сторінка 19
... difference of potential E in volts between any two points being equal to the product of the current in amperes and the resistance R in ohms included between them . This simple fact completely covers any possi- ble problem that can arise ...
... difference of potential E in volts between any two points being equal to the product of the current in amperes and the resistance R in ohms included between them . This simple fact completely covers any possi- ble problem that can arise ...
Сторінка 20
... difference of potential of 500 volts , and the same amount between the middle point and the brush . Similarly any two points on the circuit will have a difference of potential equal to fifty volts , multiplied by the number of lamps ...
... difference of potential of 500 volts , and the same amount between the middle point and the brush . Similarly any two points on the circuit will have a difference of potential equal to fifty volts , multiplied by the number of lamps ...
Сторінка 23
... difference of potential existing between any portions of the circuit will not be greater than this amount . A voltmeter connected across from the brush of B to the + brush of C would only indicate 2,000 volts , in spite of the fact that ...
... difference of potential existing between any portions of the circuit will not be greater than this amount . A voltmeter connected across from the brush of B to the + brush of C would only indicate 2,000 volts , in spite of the fact that ...
Сторінка 24
... difference between its terminals 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 ...
... difference between its terminals 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 ...
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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.