Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 266
with, or across the resist-ance. Make simultaneous read-ings of both instruments. Theunknown resistance is calculatedfrom Formula (30) R = E-C. In using this method precau-tion must be taken not to passa greater current through the object to be measured than itwill carry without heating, ^[ 257,… … Fig. 220.--Fall of Potential Method for Measurement of Resistance. 248 PRACTICAL ELECTRICITY. is especially true for measuring low resistances and for whichthis method is quite suitable. A milli-voltmeter will givegreater accuracy when the resistance is quite low, as, for ex-ample, the series field…
Electricity · Magnetism
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