Electrolytic cell or Voltameter : It is the device in which the process of electrolysis or the electrolytic decomposition is carried out is called as electrolytic cell or the voltameter.
(i) Voltameter converts the electrical energy into the chemical energy.
(ii) The electrode on which the oxidation takes place is known as anode (or +ve pole) and the electrode on which the reduction process takes place is known as cathode (or -ve pole)
(iii) During the electrolysis in voltameter cations are discharged on the cathode and anions on anode.
(iv) In the voltameter, outside the electrolyte electrons flow from anode to cathode and current flow from cathode to anode.
For voltameter, Ecell = -ve and ΔG = +ve
(v) Anions on reaching the anode give up their electrons and converted into the neutral atoms.
At anode : 
(Oxidation)
(vi) On the other hand the cations on reaching cathode take up electrons supplied by battery and converted to the neutral atoms.
At cathode : 
(Reduction)
This overall change is called as primary change and products formed is known as primary products.
The primary products may be collected as such or they undergo further change to form molecules or compounds. These are known as secondary products and the change is called as secondary change.
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