Describe the construction and working of a dry cell, with the help of a diagram?
Answers
A dry cell consists of a zinc container whose base acts as the negative electrode. The carbon rod placed at the centre with a brass cap acts as the positive electrode. This is surrounded by a mixture of manganese dioxide and charcoal in a muslin bag. The electrolyte uses is a moist paste of ammonium chloride.
Answer:
The dry cell consists of following components:
Outer metal covering: The metal covering is made up of zinc metal and is whitish in appearance.
It acts as a negative terminal of the cell.
●Electrolyte: Inside the Zinc metal, there is the electrolyte filled between two layers. Electrolyte is a wet
pulp of Zinc chloride (ZnCl 2 ) and Ammonium chloride (NH4 Cl). It is the charge carrier of electricity as it
contains negatively charged and positively charged ions.
●Metal rod: There is a graphite rod at the center of the cell. It is surrounded by paste of
Manganese
●dioxide (MnO2 ). It acts as the positive terminal of the cell.
Working of dry cell: Chemical reactions take place between the electrolyte, zinc container and
graphite rod.
Because of this, electric charge is produced on the two terminals of the cell and electric current flows in
the circuit.
●Usefulness of dry cell: They are handy and portable. The life of dry cell is longer than cells using liquid
electrolyte. Dry cells can be use in torch, T.V. or A.C remote controls, toys, etc.
