International Library of Technology · Scranton, International Textbook Co. · leaf 304
s of the two terminals a, a connected together by the flat 12 ELECTRIC LIGHTING. 17 strips b, which are made of an alloy that has practically aconstant resistance regardless of temperature changes; c, care the small flexible cables that run to the ammeter. The shunts and instruments are always… … 11. Alternating-Current Ammeters and Voltmeters. Most of the switchboard ammeters and voltmeters foralternating current consist of a coil arranged so that themagnetic field set up through it will act on a piece of iron, 17 ELECTRIC LIGHTING. 13 the movements of which actuate a pointer. Various…
Electrical engineering
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