International Library of Technology · Scranton, International Textbook Co. · leaf 200
TRICAL MEASUREMENTS. of the needle the proper value in amperes of the currentpassing through the instrument. These are called am-pere-meters, or more briefly ammeters. 2. Instruments of high resistance, so arranged that verysmall currents will give readable deflections, and with thescales usually… … 2505. Fig. 997 illustrates a method of measuring dif-ferences of potential, in which the principle of operation necessitates that no cur-rent be flowing throughthe galvanometer G. Inthe figure, abed is a re-sistance through which acurrent is flowing, sup-plied by the battery B. Itis desired to…
Electrical engineering
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