Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 634
nd usingmechanical energy to produce electrical energy. 708. Direct Current Motors. The direct current dynamo be-comes a motor when an external current is sent through its fieldmagnets and armature. It then transforms electrical energy intothe mechanical energy of the rotation of the armature. The… … Fig. 483. 6l6 ELECTROMAGNETIC INDUCTION. the armature coils an E. M. F. which opposes the current drivingthe machine. This back E. M. F. increases with the speed of themotor. Thus the current through the motor decreases as thespeed increases. When the speed causes a back E. M. F. equalto the…
Physics
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