Write a note on lead - acid storage battery.

Q. Write a note on lead - acid storage battery.

Answer:

 A storage cell that can operate both as a voltaic cell and as an electric cell, When operating as a voltaic cell it supplies electrical energy and as a result eventually becomes "run down". It must then be reacharged, When being recharged, the cell operates as an electrolytic cell. Thus, storge cell has the great advantaged of its ability to work both ways, to receive electrical energy and also to supply it:

Construction: The common example of a storage cell is the lead storage cell. One of its electrodes is made of lead. The other electrode is made of lead dioxide (PbO_{2}) or rather a paste of PbO_{2} is pressed into a grid made of lead. A number of lead plates (-ve plates) are connected in parallel and a number of lead dioxide plates (+ve plates) are also connected in parallel. The lead plates fit in between the lead dioxide plates. Various plates are separated form the adjacent ones by insulators like strips of wood or rubber or glass fibre. The entire combination is then immersed in approximately 20% H_{2}SO_{4}