Electro-dynamics: The Direct-current MotorLongmans Green and Company, 1898 - 298 páginas |
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Página 20
... watts . The energy thus supplied is expended in two ways , in heating the circuit and in doing work . The rate of expenditure of energy in the form of heat we know to be equal to the product of the resistance into the square of the ...
... watts . The energy thus supplied is expended in two ways , in heating the circuit and in doing work . The rate of expenditure of energy in the form of heat we know to be equal to the product of the resistance into the square of the ...
Página 21
... watts . If we now substitute for Fr the letter t , representing the torque in inch - pounds , we get the rate of doing work = w = 0 · 71tn watt ... ( 10 ) . This equation has been derived from purely mechanical . considerations , and ...
... watts . If we now substitute for Fr the letter t , representing the torque in inch - pounds , we get the rate of doing work = w = 0 · 71tn watt ... ( 10 ) . This equation has been derived from purely mechanical . considerations , and ...
Página 22
... watts . Nothing is here stated as to whether the dynamo is acting as a motor and doing work , or acting as a generator and having work done on it ; it is sufficient to know that a current of 70 amperes is passing , and that the induced ...
... watts . Nothing is here stated as to whether the dynamo is acting as a motor and doing work , or acting as a generator and having work done on it ; it is sufficient to know that a current of 70 amperes is passing , and that the induced ...
Página 24
... watts . This would be the rate of communication of energy to an incandescent lamp taking 0.68 ampere at 100 volts , but in this case the energy would be communicated in the form of heat . There is this important difference in the case ...
... watts . This would be the rate of communication of energy to an incandescent lamp taking 0.68 ampere at 100 volts , but in this case the energy would be communicated in the form of heat . There is this important difference in the case ...
Página 25
... of t and n , using the equation already found : w = 0.71tn watt ...... . ( 10 ) . 1 Scientific Papers , vol . ii . p . 669 . This equation is true for all forms of communication of CH . II 25 CONDITIONS OF UNIFORM MOTION.
... of t and n , using the equation already found : w = 0.71tn watt ...... . ( 10 ) . 1 Scientific Papers , vol . ii . p . 669 . This equation is true for all forms of communication of CH . II 25 CONDITIONS OF UNIFORM MOTION.
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Términos y frases comunes
accelerating current acceleration curve amperes armature B.Sc brushes cent centimetres CHEMISTRY circuit College connected in series constant Crown 8vo current curve current per motor Diagrams diameter difference distance travelled dynamo ELECTRICITY ELEMENTARY 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 gives greater Hence horizontal horse-power hysteresis Illustrations inch-pounds increase induced tension induction curve induction factor line watts lines of force load London machine magnetic circuit 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 rotation running Science series-wound motor speed curve Suppose surface conductors terminal tension tion tons torque curve torque loss total current total torque tractive effort velocity ratio volts weight Woodcuts
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