An elementary book on electricity and magnetism and their applications . ity is stored, but it is not the storage battery, as in any other battery, the electricalenergy comes from the chemical energy in the cells. Thecharging process consists in forming certain chemical sub-stances by passing electricity through a solution, just as hydro-gen and oxygen are formed in the electrolysis of water. Inthe discharging process, elec-tricity is produced by the chem-ical action of the substanceswhich have been formed in thecharging process. 195. Construction of a leadstorage battery. We may makea
An elementary book on electricity and magnetism and their applications . ity is stored, but it is not the storage battery, as in any other battery, the electricalenergy comes from the chemical energy in the cells. Thecharging process consists in forming certain chemical sub-stances by passing electricity through a solution, just as hydro-gen and oxygen are formed in the electrolysis of water. Inthe discharging process, elec-tricity is produced by the chem-ical action of the substanceswhich have been formed in thecharging process. 195. Construction of a leadstorage battery. We may makea small lead storage cell by puttingtwo sheets of ordinary lead in aglass battery jar with a very dilutesolution of sulphuric acid. Tocharge it or form the platesquickly, we connect this cell and anammeter in series with a primarybattery of three or more cells, orbetter, a d-c. generator of about 6volts (Fig. 193). While the current is passing, bubbles of gas rise from each plate. If, after a few minutes,we disconnect the generator and touch the wires of a voltmeter to. Fig Forming a lead storagecell. 284 ELECTRICITY AND MAGNETISM the lead terminals, it shows an of about 2 volts. If we thenconnect an electric bell in series with the ammeter and the lead cell,the bell rings. This indicates that a current is produced, and theammeter shows, furthermore, that the current on discharge is oppositeto that used in charging the cell. When the plates are lifted out ofthe solution after charging, plate B, the anode, is brown, due to a coat-ing of lead peroxide (Pb02), and , the cathode, is the usualgray of pure lead (Pb). In the commercial lead storage battery, the negative platesare pure spongy lead (Pb), the positive are lead peroxide (Pb02), and theelectrolyte is dilutesulphuric acid. In-asmuch as the activematerials, lead per-oxide and spongylead, are poor con-ductors of electric-ity and not hardenough to be madeinto plates, it isnecessary to attachthem to frames,called g
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
