NEET Foundation 2022.
Biology Foundation for Class 10.
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Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.
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-