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 204
-flections by the method given elsewhere, TESTING WITH VOLTMETER. 181 Testing the Resistance of Coils. If a number ofcoils are to be compared, as in a motor or dynamo,they may be tested without disconnecting themother than from the brushes, Fig. 101. Pass current through the coils as they are… … Fig. 101. low reading coils are short circuited unless the highreading coils are faulty or open. The actual resistance of each coil can be computedif an ammeter .4 M be put in series to give thecurrent value. By ohms law the resistance will equal the e.m.f. Edivided by the current or R = -y-. For…
Electric testing · Electric apparatus and appliances
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