International Library of Technology · Scranton, International Textbook Co. · leaf 438
ant-Potential En-closed-Arc Lamps.—Fig. 41 shows the arrangement of analternating-current constant-potential lamp. The generalappearance of the lamp is almost exactly the same as thatshown in Fig. 38. The principal distinguishing feature ofthe alternating-current lamp is the use of the reactance,… … Fig. 41. left so that the wire A may be connected at differentpoints. This allows the lamp to be adjusted for a consid-erable range of voltage and frequency. The reactancecoil sets up a counter E. M. F., and thus introduces an § 18 ELECTRIC LIGHTING. 71 apparent resistance into the circuit which…
Electrical engineering
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