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 |
З цієї книги
Результати 1-5 із 88
Сторінка 10
... Watts lost = E2 : 12 R = E I = R in which I is the current in amperes , R is the resistance in ohms , and E is the ... watt - seconds ) = I2 Rt = E Ir : = E2t R To find the loss of energy in heat units , any of the above values may be ...
... Watts lost = E2 : 12 R = E I = R in which I is the current in amperes , R is the resistance in ohms , and E is the ... watt - seconds ) = I2 Rt = E Ir : = E2t R To find the loss of energy in heat units , any of the above values may be ...
Сторінка 21
... watts , which is only 2.63 per cent ; consequently it is evident that the use of a little larger or a little smaller wire would not seriously affect the economical working of such a line . The substitution of No. 3 for No. 6 wire would ...
... watts , which is only 2.63 per cent ; consequently it is evident that the use of a little larger or a little smaller wire would not seriously affect the economical working of such a line . The substitution of No. 3 for No. 6 wire would ...
Сторінка 22
... watts . The New Brush Arc - Lighting System is an interesting case of series distribution . In the original type of Brush dynamo the armature is provided with two or more separate open - coil windings , connected to a corresponding ...
... watts . The New Brush Arc - Lighting System is an interesting case of series distribution . In the original type of Brush dynamo the armature is provided with two or more separate open - coil windings , connected to a corresponding ...
Сторінка 35
... watts equal to the extra pressure multiplied by the total current ; and second , it may allow great variations in poten- + ' 109.05 VOLTS 109.7 VOLTS . 111 VOLTS . 200 FT . NO . 8. .13 OHM . 5 AMP . .65 VOLTS DROP 200 FT . NO . 8. .13 ...
... watts equal to the extra pressure multiplied by the total current ; and second , it may allow great variations in poten- + ' 109.05 VOLTS 109.7 VOLTS . 111 VOLTS . 200 FT . NO . 8. .13 OHM . 5 AMP . .65 VOLTS DROP 200 FT . NO . 8. .13 ...
Сторінка 58
... watts for a large regulator . The construction as de- scribed would tend to maintain a constant potential at the points on the circuit to which the binding - posts ƒƒ ' are connected . It is evident that these may be in the station or ...
... watts for a large regulator . The construction as de- scribed would tend to maintain a constant potential at the points on the circuit to which the binding - posts ƒƒ ' are connected . It is evident that these may be in the station or ...
Інші видання - Показати все
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.