Question

describr the procedure with the help of labelled diagram to decompose water with the help of electric current and also indicate the reaction that take place during the above process

Answer 1

electrolysis is the process in which water is decomposed to H2O and O2 due to an electric current being passed through it.
how it is done :
an electric power source is connected to two electrodes(made of inert material like Pt,stainless steel or iridium). hydrogen will appear at cathode an oxygen will appear at anode.  

Answer 2

Upon Electrolysis Water decompes to form Oxygen & Hydrogen Gas.This type of decomposition reaction is called Electrolytic Decomposition.
Equation: 2H2O(l)→2H2(g)+O2(g)