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 207
the current I be one ampere,the e.m.f. one-tenth of one volt, then one-tenth 184 ELECTRICAL INSTRUMENTS. divided by one equals one-tenth, or one-tenth ofan ohm. If the armature resistance is so low that a verysmall reading is given on the millivoltmeter, in-crease the current flow by adding more… … Fig. 103. voltmeter. The larger the current through thecoils the easier the test. A form of test where an ammeter and batteryare used is given in Fig. 103. The milammeter A is adjusted by means of ashunt 5 to give a large deflection when the ter-minal leads are short circuited. Its leads are…
Electric testing · Electric apparatus and appliances
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