Resistivity

Resistivity is used to describe an electrical property of a material.Different components made from the same material will have different values of resistance because they will have different lengths or different cross-sectional areas, but the material will have the same resistivity.The resistance of a component is proportional to its length and inversely proportional to its cross-sectional area.The unit of resistivity is the ohm metre Ωm,Resistivity is affected by temperature so this equation can be used at constant temperature only.