تسجيل الدخول

تسجيل

The Dry Cell

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-352

2025-12-28

667

 is hermetically sealed at the top so that its contents cannot escape. The containing cup, Zn in Fig. 1, is of zinc, and one terminal of the cell is attached to it. The other terminal is at the top of a cylinder or plate C, composed of carbon and manganese dioxide. The space between this and the zinc cup is filled with a paste composed of one part by weight of zinc oxide, one part zinc chloride, one part ammonium chloride, three parts plaster of Paris, and two parts water. This is an open-circuit cell. It polarizes rather quickly, but is rapidly restored to its initial condition on breaking the circuit. This form of cell is sometimes used to furnish the spark for exploding the gas in automobile engines.