Electrical resistivity and conductivity

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In physics, electrical resistivity and electrical conductivity are two intrinsic properties of materials that measure a material's local, intrinsic ability to conduct electric current. They are reciprocals of each other, so each can be deduced from the other. They are usually numbers or scalar fields, but can be generalized to tensor quantities when the material is non-isotropic, or to complex quantities in the setting of time-varying currents. Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity indicates a material that readily allows electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m). For example, if a 1 m3 solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts...

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