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Dry Cell

Dry Cell

What is dry cell? Definition of Dry cell. Working of Dry cell. Principle of Dry cell.

Definition

A cell is the simplest unit for making electricity. It generates electricity from chemical reactions. It pumps electrons along wire. Two or more cells forms a battery. It is called Dry cell because it contain no liquid components. The dry cell is the modification of the wet Lechlanche cell. A dry cell is a type of electric battery, commonly used for portable electrical devices.


Dry Cell
Dry Cell

How a cell works?

Substances such as acids dissolve in water to form charged particles called positive ions (cations) and negative ions (anions). These types of solutions forms electrolyte of a cell. Metal rods immersed in electrolyte act as electrodes. Positive electrode is anode while negative electrode is cathode. These electrodes attracts oppositely charged ions resulting in flow of electrons.

Parts of Dry cell  

1.         Brass knob
2.         Positive electrode
3.         Zinc container
4.         Pitch
5.         Insulating Thick paper covering
6.         Manganese dioxide + carbon
7.         Ammonium chloride jelly
8.         Cardboard Washer 

  The Chemical Reactions                   

·       The oxidation reaction at the Zinc cathode
Zn (s).............................................................................Zn+2 + 2e-
·         The reduction reaction at the graphite anode
2NH4+ + 2MNo2 + + 2e-  ............................................. Mn2 O3 + 2NH3 + H2o
Dry cell produce a voltage of about 1.5 volts.

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