. "U" . "\\(\\textit{Voltage}\\), also referred to as \\(\\textit{Electric Tension}\\), is the difference between electrical potentials of two points. For an electric field within a medium, \\(U_{ab} = - \\int_{r_a}^{r_b} E . {dr}\\), where \\(E\\) is electric field strength.\nFor an irrotational electric field, the voltage is independent of the path between the two points \\(a\\) and \\(b\\)."^^ . . . . . . . "http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891"^^ . "\\(U_{ab} = V_a - V_b\\), where \\(V_a\\) and \\(V_b\\) are electric potentials at points \\(a\\) and \\(b\\), respectively."^^ . . . . . . . . . "Voltage"@en . . . . "\\(U_{ab}\\)"^^ .