Resistivity is defined as an electric resistance of a conductor of the unit cross- sectional area and unit length. Its unit is ohm meter. A characteristic property of each material, resistivity is used to differentiate various materials based on their ability to conduct electric currents. The value of resistivity depends on the temperature of the material. The resistivity of metallic conductors usually increases with a temperature rise. The electrical resistivity can be defined as an electrical resistance per unit length and per unit of cross-sectional area at a specified temperature. Copper is a good conductor of electricity as it provides a low level of resistivity. Thus, all three copper wires of different lengths and different areas of the cross-section will have the same resistivity.