. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . Fiff. 7. 88 THE ELECTRIC CURRENT. 29 plates, and the only effect is to decrease the internal is evident that coupling two cells in parallel affords twopaths for the current* and so decreases the resistance of the twocells to one-half that of a single cell. The formula express-ing the current that would tlow in the external circuit with t\TOcells in parallel is therefore. E / = ^ + 4- or for n cells
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . Fiff. 7. 88 THE ELECTRIC CURRENT. 29 plates, and the only effect is to decrease the internal is evident that coupling two cells in parallel affords twopaths for the current* and so decreases the resistance of the twocells to one-half that of a single cell. The formula express-ing the current that would tlow in the external circuit with t\TOcells in parallel is therefore. E / = ^ + 4- or for n cells connected in parallel, the formula for current is, /. Fig. 8. Fig. 8 represents a combination of the series and parallelmethod of connecting and represents four files of cells joined Inparallel and each file having four cells connected in series. TheE. M. F. of each file and consequently of the circuit is 4 E. The resistance of each file is 4 /■ and that of all the files 4/ Hence, the formula for current is, / = 4^ 7? 4a- If there were n files connected in parallel and in cells were 89 30 THE ELECTRIC CURREXT. conriected iu series in each tile, tlie formula expressing tlie currentin the external circuit would be. J _ til E n wliere E is the E. M. F. of each cell, R the external resistance,and r the internal resistance of each cell. The most advantageous method of connecting cells dependsupon the results desired, the resistance of the cell and the externalresistance. Suppose it is desired to pas^ a current through anexternal resistance of 2 ohms, and that Daniells cells are to beused each having an E. M. F. of 1 volt and an internal res
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