Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 143
f the current in thewire be reversed and sent up instead of down. The experiment can be further variedby reversing the magnetizing current of the electromagnet. from the lower to the upper brush. In both cases the upper brush ispositive. In the dynamo, however, where energy is being suppliedto the… … Fig. 394.—Showing relative directions of armature current and reverse electromotive force of amotor. When a motor is in operation, the wires around the periphery of its armaturecut the magnetic lines of force produced by the field magnet exactly as in the case ofthe dynamo. Consequently, an…
Electrical engineering
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