Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 68
rx.If the error is not to exceed p per cent, then the internal resistance rx must be less than ohms. TheE.M.F. of high-resistance cells cannot be correctly measured by theabove method, even with voltmeters of relatively high resistance, but it isbetter done by one of the methods mentioned below.… … Fig. 42. First connect battery A in series with the voltmeter and a resistance r,switch B being closed, and note the deflection V; then open the switch B,and throw in the resistance rx, and note the deflection Vx. Now connect bat-tery X in place of A, and close the switch B, and vary the resistance…
Electrical engineering
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