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 197
method is Fig. 96, where one movablebrush is used, the other voltmeter connectionbeing on one of the regular working brushes. 174 ELECTRICAL INSTRUMENTS. This shows a gradual rise or fall of e.m.f. untilthe total e.m.f. of the generator is reached, butnot so readily the actual e.m.f. of any one… … Fig. 97. so that the current consumption can also be fig-ured. The ammeter also is necessary if the resist-ance of L is to be determined. The drop across L will be directly indicated byV. The current shown by A multiplied by thee.m.f. at L will give the watts expended in L. Lamp Current Efficiency…
Electric testing · Electric apparatus and appliances
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