Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 86
f the galvanometer. TESTING AND TESTING APPARATUS 505 Now, replace the known high resistance (100,000 ohms) bythe unknown resistance (for instance such as a cable) the value ofwhich is to be determined. Add enough cells to produce as largea deflection of the needle as possible. Assume that 75 cells… … Fig. 582.—Commutator plug setting for comparing electromotive forces by the fall of potentialmethod with Queen acme set. .8 megohm X 75 cells = 60.0; and60.0 -T- 1.5 = 40 megohms as the resistance of the cable. Fall of Potential Method with Queen Acme Set.—To compare electromotive forces by this…
Electrical engineering
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