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 253
0) R = ^ = ^^ = 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 + 4.5 4- 36 = 45 ohms. By Formula (33) E. M. F. =C X (R + r) =10 X45 = 450 volts (b). By Formula (62)… … MEASUREMENT OF PRESSURE. 235 210 ohms and the current =-^7: = 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…
Electricity · Magnetism
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