Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 105
ily be shown by experiment. If for example a motor, con- 80 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap.xiv nected as shown in Fig. 104, is driving a flywheel, and the switchS is suddenly opened so as to disconnect the armature from thepower mains, the flywheel will keep the machine running, but… … Fig. 104.—Experimental determination of the back e.m.f. Example: Let Ea, the applied voltage, be 110, Ia the armature current,100 amp., and Ra the armature resistance, 0.04 ohms. The voltmeterreading will be 110 volts while switch S is closed but will drop suddenly to110 — (100 X 0.04) = 106 volts…
Electrical engineering
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