Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
Dentro del libro
Resultados 1-5 de 20
Página 25
... rheostat , since the dimensions of rate of communication of energy are always the same , viz . a force multiplied by a distance and divided by a time ; but in the case of heat we cannot measure the force experimentally , and therefore ...
... rheostat , since the dimensions of rate of communication of energy are always the same , viz . a force multiplied by a distance and divided by a time ; but in the case of heat we cannot measure the force experimentally , and therefore ...
Página 34
... rheostat , and an adjustable rheostat is placed in series with the armature , so that the resistance can be varied and the motor brought to a standstill . On the shaft is placed a pulley with a cord attached , which is wound round the ...
... rheostat , and an adjustable rheostat is placed in series with the armature , so that the resistance can be varied and the motor brought to a standstill . On the shaft is placed a pulley with a cord attached , which is wound round the ...
Página 40
... rheostat were left in the circuit , the motor would attain a speed given by Equation 13 , where R is the resistance of the motor and the starting rheostat . In practice , when a sufficient speed has been attained , and the current ...
... rheostat were left in the circuit , the motor would attain a speed given by Equation 13 , where R is the resistance of the motor and the starting rheostat . In practice , when a sufficient speed has been attained , and the current ...
Página 60
... rheostat used for the purpose of starting or regulating , E being measured outside such resistance . Example 21. — If E = 120 , M = 5 , R = 0 · 2 , the maxi- mum possible speed is 1,440 r.p.m. If the load is 845 inch - pounds , the ...
... rheostat used for the purpose of starting or regulating , E being measured outside such resistance . Example 21. — If E = 120 , M = 5 , R = 0 · 2 , the maxi- mum possible speed is 1,440 r.p.m. If the load is 845 inch - pounds , the ...
Página 61
... rheostat may be cut out altogether . In this way we can deter- mine the resistance of each step of a rheostat that can be used with a given motor , so that the current shall not exceed a certain fixed amount . A rheostat is sometimes ...
... rheostat may be cut out altogether . In this way we can deter- mine the resistance of each step of a rheostat that can be used with a given motor , so that the current shall not exceed a certain fixed amount . A rheostat is sometimes ...
Otras ediciones - Ver todas
Términos y frases comunes
45 amperes accelerating current acceleration curve amperes armature B.Sc brushes cent centimetres CHEMISTRY circuit College Crown 8vo current curve current per motor Diagrams diameter difference distance travelled driving wheel dynamo ELECTRICITY Engineers equal Example expenditure of energy f.p.s. per second feet per second final speed find the induction foot-pounds force factor frictional torque full speed gearing given distance gives greater Hence horizontal horse-power hysteresis Illustrations inch-pounds increase induced tension induction curve induction factor line watts lines of force lines per pole load machine magnets main shaft maximum current mechanical efficiency mechanical watts miles an hour motor shaft obtained pole-tip pounds railway motor reduced represent resistance to motion revolutions per minute revolutions per second rheostat running series-wound motor speed curve starting rheostat Suppose surface conductors terminal tension tion tons torque curve torque loss total torque tractive effort velocity ratio volts weight Woodcuts
Pasajes populares
Página 27 - THE GLACIERS OF THE ALPS : being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related.
Página 16 - OTHER- WORLDS THAN OURS ; The Plurality of Worlds Studied under the Light of Recent Scientific Researches.
Página 28 - Price 3$. 6d. On the STRENGTH of MATERIALS and STRUCTURES : the Strength of Materials as depending on their quality and as ascertained by Testing Apparatus ; the Strength of Structures, as depending on their form and arrangement, and on the materials of which they are composed. By Sir J.
Página 27 - Notes of a Course of Nine Lectures on Light, delivered at the Royal Institution. , By John Tyndall, FRS Crown 8vo. is. sewed, or is. 6d. cloth. Notes of a Course of Seven Lectures on Electrical Phenomena and Theories, delivered at the Royal Institution.
Página 4 - Works by R. LLOYD WHITELEY, FIC, Principal of the Municipal Science School, West Bromwich. CHEMICAL CALCULATIONS. With Explanatory Notes, Problems and Answers, specially adapted for use in Colleges and Science Schools. With a Preface by Professor F. CLOWES, D.Sc. (Lond.), FIC Crown 8vo., 2s.
Página 16 - HALF-HOURS WITH THE STARS: a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position ot the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year.
Página 27 - ESSAYS ON THE FLOATING MATTER OF THE AIR IN RELATION TO PUTREFACTION AND INFECTION.
Página 10 - MARINE BOILER MANAGEMENT AND CONSTRUCTION. Being a Treatise on Boiler Troubles and Repairs, Corrosion, Fuels, and Heat, on the properties of Iron and Steel, on Boiler Mechanics, Workshop Practices, and Boiler Design. By CE STROMEYER, Chief Engineer of the Manchester Steam Users' Association, Member of Council of the Institution of Naval Architects, etc.
Página 28 - INTRODUCTION TO THE STUDY OF CHEMICAL PHILOSOPHY. The Principles of Theoretical and Systematic Chemistry. With 5 Illustrations. Fcp. 8vo., 5s. With ANSWERS to Problems. Fcp. 8vo., y. 6d. PRACTICAL CHEMISTRY. The principles of Qualitative Analysis. Fcp. 8vo. , 1s. 6d. WATTS DICTIONARY OF CHEMISTRY.
Página 20 - Garrod. — WORKS BY SIR ALFRED BARING GARROD, MDFRS A TREATISE ON GOUT AND RHEUMATIC GOUT (RHEUMATOID ARTHRITIS). With 6 Plates, comprising 21 Figures (14 Coloured), and 27 Illustrations engraved on Wood. 8vo.