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Resistance
The resistance is known as the property of substance by virtue of which it opposes the flow of current through it.
Formula-
For a conductor of resistivity
having a length of a conductor= l
and Area of a crosssection of conductor= A
Then the resistance of a conductor is given as
Where
Resistivity
Its S.I unit is
or ohm 
Its Dimensions is
Resistivity or Specific Resistance
As
If l=1 m and A= 1 m^2
Then R=
So Resistivity is numerically equal to the resistance of a substance having a unit area of cross-section and unit length.
If m is the mass, n is the number of electrons per unit volume, e is the charge of the electron and
is the relaxation time
Then
Its S.I Unit is Ohm.m
Its Dimensions-