UV Index Resources. 1  Download the free UV Index smartphone app. 2  Stay up to date with our UV Index applications. 3  UV Alert map Exit- Areas in the U.S. where the UV Index is forecasted to be above normal. 4  Cities forecast bulletin Exit- A plain text listing of forecasted UV Index values for 58 U.S. cities.
High electrical conductivity refers to the ability of certain materials to conduct a large amount of electrical current. Electrical conductivity is abbreviated by the Greek letters sigma (Ï) or kappa (Îº). The SI unit of electrical conductivity is Siemens per meter (S/m).
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.The inverse quantity is electrical conductance, the ease with which an electric current passes.esistivity and conductivity are reciprocals : . Resistivity is a measure of the material's ability to oppose electric current. This formula is not exact, as it assumes the current density is totally uniform in the conductor, which is not always true in practical situations.