Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book by Swoope Coates Walton

Author:Swoope, Coates Walton. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Electricity, Magnetism
Publisher: New York, D. Van Nostrand company
Published: 1903-03-25T05:00:00+00:00

now indicates only 40 volts. The difference in pressure between points A and B is 20 volts, since twice the current through the same resistance requires double the pressure to be applied. The available pressure applied to the lamps is 40 volts. If the wires considered above were just double the area, only one-half of the pressure would be lost on the leads, and therefore one-half of the energy lost, and a higher available P. D. at point B would be maintained.

Suppose the transmitting line to be composed of several wires of different sizes connected in series as represented

GS) eov*. GS) .ouu C^> 4ov.u. J>J **• heavy and

\t-if ^ -\s__s<t —>. \*_i/ thin lines in Fig.

^ i . . . . 206. With one * lamp connected at B, the voltmeter may read 50 volts, as be-

Fig. 205.—" Volts Drop" in an Electric Circuit. f ore | 3U ^ -^g f a ]|

of potential or drop on the line, 10 volts, will not now be uniform, since the resistance is not uniform. The greatest potential difference or drop will be between the points of highest resistance. Consider the equal lengths of wire E F and F G of unequal areas. The current is the same through each, but the voltmeter indicates 3 volts when connected across points E F, and only 1 volt when placed across points F G. The thin wire E F has three times the resistance of the wire F G, since three times

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