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
... efficiency ; and third , it produces heating of the conductors , which may destroy the insulation or give rise to danger of fire . Each of these effects will be considered separately later . The determination of electrical resistance ...
... efficiency ; and third , it produces heating of the conductors , which may destroy the insulation or give rise to danger of fire . Each of these effects will be considered separately later . The determination of electrical resistance ...
Сторінка 24
... efficient , occupy more space , and demand more attention than a single large machine . If desired , the number of lamps on any loop may be increased or decreased , since the current is kept constant by a regulator on the dynamo ; and ...
... efficient , occupy more space , and demand more attention than a single large machine . If desired , the number of lamps on any loop may be increased or decreased , since the current is kept constant by a regulator on the dynamo ; and ...
Сторінка 98
... efficient than static transformers . But it has been shown that they may be compound or over - compound wound , in order to supply a uniform or rising voltage , which is not practicable with static transformers . Furthermore , it is ...
... efficient than static transformers . But it has been shown that they may be compound or over - compound wound , in order to supply a uniform or rising voltage , which is not practicable with static transformers . Furthermore , it is ...
Сторінка 111
... efficiency , and being more troublesome to take care of . In almost every other respect the direct current is preferable for electric lighting ; and where the distances are not great , as , for example , in isolated plants and central ...
... efficiency , and being more troublesome to take care of . In almost every other respect the direct current is preferable for electric lighting ; and where the distances are not great , as , for example , in isolated plants and central ...
Сторінка 149
... efficiency is 97 per cent . In most cases trans- formers are used to reduce a high - voltage supply of energy into low - voltage energy that is safe and convenient for operating lamps , motors , and other devices . Sometimes they are ...
... efficiency is 97 per cent . In most cases trans- formers are used to reduce a high - voltage supply of energy into low - voltage energy that is safe and convenient for operating lamps , motors , and other devices . Sometimes they are ...
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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.