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 335
316 PRACTICAL ELECTRICITY. … Fig.Circuit Trans-former. by an interrupter in a direct current circuit or by an alternat-ing current. In all transformers the relation of the induced E. M. F.generated in the secondary circuit to that employed in theprimary, is nearly proportional to the ratio of the number ofturns in each…
Electricity · Magnetism
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