Question

describe the construction working and usefulness of a dry cell with the help of a diagram

Answer 1

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. The outer body (excluding the base) of the zinc container is insulated with cardboard.  When the dry cell is connected in a circuit comprising a bulb, current flows in the circuit due to the chemical reaction that takes place in the cell. This makes the bulb glow. The dry cell is a primary cell and it cannot be recharged.

Answer 2

Answer:

Here is your answer

Construction of dry cell

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 (ZnCl2) and Ammonium chloride (NH4Cl). 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 centre 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 graphide 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.