elektromos feszültség , elektromos potenciálkülönbség
электростатический потенциал
מתח חשמלי (הפרש פוטנציאלים)
The Electric Potential is a scalar valued quantity associated with an electric field. The electric potential $\phi(x)$ at a point, $x$, is formally defined as the line integral of the electric field taken along a path from x to the point at infinity. If the electric field is static, that is time independent, then the choice of the path is arbitrary; however if the electric field is time dependent, taking the integral a different paths will produce different results.
Applicable units are those of quantitykind:ElectricPotential
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
$-\text{grad} \; V = E + \frac{\partial A}{\partial t}$, where $E$ is electric field strength, $A$ is magentic vector potential and $t$ is time.
http://www.iso.org/iso/catalogue_detail?csnumber=43012