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The Daniell Cell

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-349

2025-12-28

545

This is an early form of cell in which a zinc bar is placed in a porous cup containing dilute sulphuric acid, while a copper cylinder and a solution of copper sulphate are in a larger glass jar holding the porous cup. As the sulphuric acid acts upon the zinc, zinc sulphate is formed within the porous cup, while hydrogen is displaced from the sulphuric acid and passes through the porous cup. This hydrogen displaces the copper from the copper sulphate and the copper is deposited on the copper plate. In order to keep up the strength of the copper sulphate solution, copper sulphate crystals are placed in a cup attached to the cylinder in the outer jar.