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 247
es E and R. E has exactly thesame resistance as the wire A B. R has a resistanceof 100 ohms. Either resistance may be short-cir-cuited by a small switch. The resistances showTn 224 ELECTRICAL INSTRUMENTS. between the ground post and the battery and be-tween post BA and the battery key are simply… … Fig. 128. two posts i and 2 is gotten from the formula A -j R. To avoid the necessity of solving 1000 — /i A X in each case the fraction :, a table is fur- 1000 — -4 nished with the set, giving the value of this fraction LOCATING FAULTS IN WIRES. 225 for each value of A. The resistance is…
Electric testing · Electric apparatus and appliances
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-388-169.webp)
