. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . or is therefore equivalent to 634,555 — 63,455,or 571,100 watts. This in mechanical units is equal to 571,100 -f-746, or 765 horse-power approximately. Hence from an input of 1,000 horse-power at tlie generatingstation, the work the motor is capable of performing at the receiv-ing station is 765 horse-power. The efficiency of the entiresvstem under the assumed conditions is therefore 765 ~ 1,000, %. .Vmong
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . or is therefore equivalent to 634,555 — 63,455,or 571,100 watts. This in mechanical units is equal to 571,100 -f-746, or 765 horse-power approximately. Hence from an input of 1,000 horse-power at tlie generatingstation, the work the motor is capable of performing at the receiv-ing station is 765 horse-power. The efficiency of the entiresvstem under the assumed conditions is therefore 765 ~ 1,000, %. .Vmong the great variety of generating machines, systems ofdistribution and auxiliary devices, each has its particular advan-tage for special condicions, and the selection of the type of ma-chine and system of distribution depends almost entirely upon thespecial circumstances. For example, a low voltage system is bestadapted for isolated plants, whereas for the transmission of powerlong distances very high voltages are used. The various types ofmachines, systems, etc., with their special advantages and disad-vantages will be fully considered in the following InstructionPapers. 102. Seven 5000 H. P. ^estinghouse Generator at NiagaraFalls Power Co. ELECTRICAL MEASUREMENTS. ABSOLUTE AND PRACTICAL UNIT5. Fundamental Units. All physical quantities such as volumesvelocity, force, etc., are derived Irom, and can be expressed inteiuis of the thiee fundamental quantities: length, mass, andtime. Each of these quantities is independent of the other, andcan only be measured ir terms of its own units. The system of units in almost universal use by engineers andupon which the electrical units are based, is the absolute orCentimetre=Qramme=Second system, which is usuall}^ abbrevi;itedto tlie C. G. S. system. The fundamental units in this sy-stemare : — The Centimetre as a unit of length; The Gramme ; a unit of mass : The Second as a unit of time. The Foot=Pound=Second system is also used
Size: 1418px × 1762px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidcyclopediaofappl00ameruof
