Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 143
also read on theammeter. Then r or the resistance of the battery is equal to—\ Most of the above methods are only suitable fornon-polarizing cells or cells of low internal resist- 120 ELECTRICAL INSTRUMENTS. ance. The Wheatstone Bridge methods are pre-ferable. Resistance of Battery by Bridge. In… … Fig. 78. Formula. Then the resistance of C will equal T> the result obtained by multiplying R by — In the formula R is resistance of rheostat, Bthat of arm B of bridge, and ^4 that of arm ^4 ofbridge. Measuring Current Flow of Cell. The rate ofcurrent flow of a cell may be deduced from Ohms…
Electric testing · Electric apparatus and appliances
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