An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 281
174. — Prony brake used to measure output of raH0 0f output to in-a motor. put. We can easilymeasure the number of amperes and the number of volts sup-plied to the motor and thus compute the watts put in. To get the output of mechanical work, engineers usuallymake a brake test. One simple form of… … DIRECT-CURRENT MOTORS 251 When the motor revolves, friction is developed between thelining of the brake and the pulley, which thus converts thepower of the motor into heat. The brake pressure is controlledby a small handwheel, and thus any desired load is obtained. From the force (F) exerted at the…
Electricity · Magnetism
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