Electrochemistry may be defined as “The branch of chemistry which deals with the quantitative study of inter-relationships between chemical energy and electrical energy and inter-conversion of one form into another.
Relationships between electrical energy taking place in red-ox reactions.
A cell is of two types : I. Galvanic cell II. Electrolytic cell
In Galvanic cell, the chemical energy of a spontaneous redox reaction is converted into electrical work.
In Electrolytic cell, electrical energy is used to carry out a non-spontaneous redox reaction.