Ohms Law-Ohm’s law STATES that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm’s law is V=IR.Factors on which resistance of a conductor DEPENDS- The resistance of a conductor depends on thickness (cross SECTIONAL area of the WIRE), length and temperature.The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.Resistivity is defined as the measure of the resisting power of a specified material to the flow of an ELECTRIC current.The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.R=ρl/A where R = Resistance of the conductor where R = Resistance of the conductorρ = Resistivity of the conductor where R = Resistance of the conductorρ = Resistivity of the conductorl = length of the conductor where R = Resistance of the conductorρ = Resistivity of the conductorl = length of the conductorA = Area of cross section where R = Resistance of the conductorρ = Resistivity of the conductorl = length of the conductorA = Area of cross sectioni.e., ρ=RA/l Unit of resistivity is Ωm.