Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 118
nstruments. But in such practice the instrument must be ELECTRICAL INSTRUMENTS 101 equipped with a key switch so as to shift from one service tothe other. Fig. 112 shows such an instrument connected tothe circuit to read volts. If we assume the nioval)le coil has20 ohms resistance, and that a… … Fig. 112 Fig. 113 Fig. 112.—Volt-ammeter connected to read volts.Fig. 113.—Volt-ammeter connected to read amperes. = 0.01 ampere will flow through the coil, j^E 50 ~ R 5,000 which would cause it to move to division 50, as indicated. On the other hand, if the instrument is connected in thecircuit,…
Electric machinery
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