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 253
ormula (30) R = ?i = 45 = 4.5 ohms per lamp.C 10 Resistance of 8 lamps in series = 8 X 4.5 = 36 ohms. By Formula. (29) E = C X R = 10 X 36 = 360 volts potential dif-ference (a). Total resistance, r + R = 4.5 -f- 4.5 + 36 = 45 ohms. By Formula (33) E.M.F.-CX (R +r) = 10 X45 = 450 volts (b). By… … MEASUREMENT OF PRESSURE. 235 232. Variation of Potential Difference with Variationof External Resistance.— Exp. 64: Connect a voltmeter to a Grenet cell and also a variableresistance, R, in series with an ammeter, Fig. 210. With switch, S,open, the voltmeter indicates 2 volts or the E. M. F. of the…
Electricity · Magnetism
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