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 252
strations the pressure was assumed to be main-tained constant at point A. Consider now a battery ordynamo D, Fig. 207, with an internal resistance (r) of 4 ohmsconnected to one lamp at B, 10 feet distant from A. Thevoltmeter at A indicates 60 volts as before, and with oneampere flowing through the… … Fig. 207.—E. M. F. and Potential Difference in an Electric Circuit. Formula (29). The total pressure or E. M. F. is, therefore,4 4~ 10 -f- 50 or 64 volts. The voltmeter across the generatorterminals, however, indicates the potential difference or thatportion of the E. M. F. available in the…
Electricity · Magnetism
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