Calculate the maximum and minimum value of external resistance necessary

Posted on 2014-01-23 11:38:00 in Engineering by COLI :D

Thirty five lead acid secondary cells each of discharge capacity 120 Ah at 12 hours rate are to be fully charged at constant current for 10 hours. The d.c. suppy is 125 volts the ampere-hour efficiency is 80% and the e.m.f. of each cell at start and at the end of the charge is 1.9 volts and 2.6 volts respectively. Calculate the maximum and minimum value of external resistance necessary. Neglect the internal resistance of the cells.

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