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).
Electrical resistivity is a measure of a materialâs property to oppose the flow of electric current. This is expressed in Ohm-meters (Ïâm). The symbol of resistivity is usually the Greek letter Ï (rho). A high resistivity means that a material does not conduct well electric charge.