The book Electrical Engineering: An Elementary Text-book was written by author E Rosenberg Here you can read free online of Electrical Engineering: An Elementary Text-book book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electrical Engineering: An Elementary Text-book a good or bad book?
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On discharging the cell both the lead and lead peroxide are changed to lead sulphate. Under normal conditions an accumulator should never be dis- ACCUMULATORS 183 charged so that its E. M. F. Falls lower than 1. 80 to 1. 83 volts. For the purpose of charging, a higher pressure is necessary. Soon after the beginning of the charge the E. M. F. Of a cell rises to two volts, and when completely charged becomes 2. 5 to 2. 7 volts. When gas is evolved from both plates of the accumulator, the end of t...he charge is indicated, and that no more oxygen is being absorbed by the positive plate. The rising of the voltage during charging is firstly due to the chemical change of the plates, and then for two other reasons. There are formed bubbles of hydrogen and oxygen, which increase the back E. M. F. Of the accumulator, and further the accumulator has of course an ohmic resistance, to overcome which requires the expenditure of certain E. M. F. After charging, the voltage of the accumulator falls immediately, down to 2.
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