Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 415
hat inwhich 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 l^een ascertained. Place the left hand, asshown in Fig. 243, so that the fingers correspond with… … ^i^HhiH 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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