Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . s the discharging current. Lead plates in dilute sulphuric acid were first used byPlante, from whom this type of cell takes its name. The ELECTROLYSIS. 85 action in charging such a cell is as follows : Electrolysis ofwater liberates oxygen on one plate (the positive) whichcombines with the lead to form lead peroxide (Pb02), whilehydrogen accumulates on the other plate (the negative). Ondischarging the cell the oxygen of the peroxide plate com-bines with the hydrogen ofthe liquid, lib
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . s the discharging current. Lead plates in dilute sulphuric acid were first used byPlante, from whom this type of cell takes its name. The ELECTROLYSIS. 85 action in charging such a cell is as follows : Electrolysis ofwater liberates oxygen on one plate (the positive) whichcombines with the lead to form lead peroxide (Pb02), whilehydrogen accumulates on the other plate (the negative). Ondischarging the cell the oxygen of the peroxide plate com-bines with the hydrogen ofthe liquid, liberating oxygen,which, in turn, combineswith the hydrogen of anadjacent molecule, untilfinally the hydrogen on theother plate is reached. Com-mercial storage batteries aremodifications of the abovetype. The E. M. F. of sucha secondary cell is about Fig. 96 illustrates theconstruction of an accumu-lator. The discharging currentdepends upon the area ofthe plates used, while thelength of discharge dependsupon the weight of theplates. To increase the rateof discharge, a number ofplates are fastened to. one Fig. 96.—Chloride element, two plates; negative ele-ment, three plates. terminal forming the negativeelement, or grid, and one less than the number used formthe positive element (the active plate). The plates arethen dovetailed together, and prevented from touching-eachother by the insertion of rubber bands or ebonite strips. Thesolution used is dilute sulphuric acid (about a 20 per cent, so-lution). The lead plates are sometimes perforated, and intothe perforations of the positive plates is pressed red lead,while the negative perforations are rilled with finely dividedparticles of metallic lead. QUESTIONS. 1. Xame all the effects of an electric current and give a commercialapplication of each. 2. Explain the principle of an electric incandescent lamp. 3. Why is it that the lead wires to a lamp do not get as hot as thecircuit inside the glass bulb
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