Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 415
any dynamo will rotate when used as a motor, can befound by the left-hand rule, page 278, when the polarity ofthe field magnets and the direction of current through thearmature have been ascertained. Place the left hand, asshown in Fig. 243, so that the fingers correspond with thepolarity and… … =UHi*H Fig. 373.—Single Loop ArmatureDriven as a Motor. The dotted arrows indicate the direc-tion of counter E. M. F. tion of a motor can be changed by reversing the currenteither through the armature or through the fields, but notthrough both. If both are changed, the motor will run inthe same…
Electricity · Magnetism
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