Electrochemistry deals with the chemical changes and electrical energies.
Electrical energies is taken through matter in the form of an electric current.substance which allow the passage of electric current through them are called conductors.while those which do not allow electric current to pass through are called insulators.
Conductors are of two types. they are electronic or Metallic. metallic conductors:-which allow the conduction by the movement of electrons electrolytic conductors:-here conduction takes place by the movement of ions prodused by the decomposition of electrolytes.
Electrical resistance oppose the flow of current .As per ohms law resistance of any conductor is directly proportional to the length of conductor and inversely proportional to area of cross section of conductor.
Where ρ =specific resistance,l =length,A =area
if l =1CM, A =1CM², then R =ρ
The unit of resistivity is ohm(Ω) cm
K =1/ρ = l/RA where k is specific conductance or conductivity.
The resiprocal or resistance is called conductance.It measure the current flows through a conductor or solution.Its unit is MHO.