Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 155
is obtained by sliiling tlie contact point U along thewire until a point is found when no current flows througli the gal-vanometer. Under these conditions the potential at £ must be the 134 ELECTRICAL MEASUREMENTS. 33 same as that at F and as in the Wheatstone bridge the ratio of thearms between… … then if the resistances of A, B. and R are known that of X maybe calculated from the formula A-\- a If A and B are replaced by straps of negligible resistance then the value of the unknown resistance may be found from the simple ratio, R : X: : a . h, giving X = — X R- a Since the resistance of the…
Electrical engineering
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