International Library of Technology · Scranton, International Textbook Co. · leaf 401
ant-potential § 18 ELECTRIC LIGHTING. 33 circuits are usually considerably higher than the voltagerequired by a single arc lamp, so that the excess voltagemust be taken up in a resistance. If an arc lamp were connected directly to constant-poten-tial mains, without the intervention of any… … Fig. 21. increase. On the other hand, if the current decreases, theresistance of the arc increases. The consequence is that ifthe constant voltage of the mains was just equal to thatrequired by the arc and if the current through the arcshould, for any reason, decrease a little, the…
Electrical engineering
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