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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 154

An illustration from Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets, 1907, leaf 154
obtained with8855 ohms in rheostat and e.m.f. of standard cellis 1.44. Then -r— ■ = 89.55 and this multiplied by 1.44 = 128.95 volts as e.m.f. of outside circuit. Formula. Let R = rheostat at balance; B = THE POTENTIOMETER. 131 resistance of B arm, e = e.m.f. of standard cell,and E, e.m.f. to be… … R A Sourc* o^HltXT, Fig. SO. The operation to be performed here is the check-ing of a voltmeter. 5 C is a standard cell, .4 one arm of the bridge,R the rheostat. A key and shunt are in the galvanometer circuitand a key or switch in the power circuit. Thelatter may be a tap from a direct current…

Electric testing · Electric apparatus and appliances

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