Electrical Engineer's Pocket-book |
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Other editions - View all
Electrical Engineer's Pocket-Book: A Hand-Book of Useful Data for ... Horatio Alvah Foster No preview available - 2017 |
Common terms and phrases
adjusted air-gap alternating current alternating-current ammeter ampere-turns amperes apparatus armature armature core battery braid brushes cable capacity cell cent centimeter circuit coil commutator condenser conductor connected constant copper core loss cross section current flowing curve deflection density determined diagram diameter direct current drop ducts dynamo eddy currents efficiency Electric electromotive force equal excitation feet field flux force formula frequency friction full load galvanometer Gauge gutta-percha heat hysteresis increase instrument insulation resistance iron lamps lead length machine magnetic manhole maximum measured Megohms meter method Microhms Mils non-inductive ohms phase poles potential potentiometer pounds pressure R₁ ratio reactance reading regulation rheostat rubber secondary self-induction shown in Fig shunt slots Specific speed square inch standard Stranded switch synchronous terminals Thickness three-phase tion transformer unit varies voltage voltmeter volts wattmeter watts weight Wheatstone bridge winding wire zinc
Popular passages
Page 9 - As a unit of current, the international ampere, which is one-tenth of the unit of current of the CGS system of electro-magnetic units, and which is represented sufficiently well for practical use by the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with accompanying specifications,1 deposits silver at the rate of o.ooi 1 1 8 of a gramme per second.
Page 9 - ... the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2. J of the electromotive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15°...
Page 13 - If, however, a great deal of the turpeth mineral is formed it shows that there is a great deal of the acid sulphate present, and it will then be wiser to obtain a fresh sample of mercurous sulphate rather than to try by repeated washings to get rid of all the acid. The free mercury helps in the process of removing the acid, for the acid mercuric sulphate attacks it, forming mercurous sulphate and acid which is washed away.
Page 10 - As the unit of induction, the henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt, while the inducing current varies at the rate of one ampere per second.
Page 502 - Single-Phase. A term characterizing a circuit energized by a single alternating emf Such a circuit is usually supplied through two wires. The currents in these two wires, counted positively outwards from the source, differ in phase by 180 degrees or a half-cycle.
Page 9 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water...
Page 504 - Diversity factor is the ratio of the sum of the maximum power demands of the subdivisions of any system or parts of a system to the maximum demand of the whole system or of the part of the system under consideration, measured at the point of supply.
Page 10 - It is to be nearly filled with the solution and connected to the rest of the circuit by being placed on a clean copper support to which a binding screw is attached.
Page 781 - ... 3. Where any rails on which cars run or any conductors laid between or within three feet of such rails form any part of a return, such part may be uninsulated. All other returns or parts of a return shall be insulated, unless of such sectional area as will reduce the difference of potential between the ends of the uninsulated portion of the return below the limit laid down in Regulation 7. 4. When any uninsulated conductor laid between or within three feet of the rails forms any part of a return,...
Page 782 - Provided that in place of such two earth connections the company may make one connection to a main for water supply of not less than three inches internal diameter, with the consent of the owner thereof and of the person supplying the water, and provided that where, from the nature of the soil or for other reasons, the company can show to the satisfaction of...