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 306
Fig. 2oi.—Dynamometer Ammeter for Alternating or Direct Currents. Portable Form. ELECTRO D YNAMICS. 287 … expended in a circuit is equal to the product of the volts, E,and the current C, or W = E X C, Formula (62). Thesefactors ma} be determined bya volt and an ammeter andmultiplied together, or themultiplication may be auto-maticall} performed by usinga form of Siemens dynamom-eter which measures the…
Electricity · Magnetism
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