Electric cells

Alkaline batteries

Alkaline batteries In the year 1900, Thomas Edison in America and Valdemar Jungner in Sweden both invented storage cells using a solution of caustic potash as the electrolyte. Edison used iron for the negative plate and Jungner used cadmium. Both men used nickel hydroxide for the positive plate. Cadmium has certain advantages over iron, and present-day cells …

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Care of lead cells

Care of lead cells The level of the sulphuric acid in a lead cell should be inspected regularly and any loss from evaporation made up with distilled water only. Acid should never be added except in rare cases where spillage has occurred. Lead cells must be charged regularly, using the maker’s recommended charging current, and not left …

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The dry cell

The dry cell The dry cell is a form of Leclanche cell in which the ammonium chloride solution is replaced with a jelly composed of starch, flour and ammonium chloride (Fig. 34.6). The positive element consists of a carbon rod surrounded by a core of a compressed mixture of manganeseuv) oxide and carbon. This is placed inside …

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The Leclanche cell

The Leclanche cell Following the discovery of the simple cell, came the invention of a number of different cells in which polarization was either reduced or eliminated. All these have long since passed into history, but one which survived until comparatively recent times was the Leclanche cell, invented by Georges Leclanche about 1865. It has an e.m.f of …

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