ISQ tuletatud suurus, ISQ derived quantity, aine või materjali võime juhtida elektrit ehk anda edasi elektrilaenguid, for a resistive two-terminal element or two-terminal circuit with terminals A and B, quotient of the electric current i in the element or circuit by the voltage uAB between the terminals, property of a resistive element, equal to the scalar quantity given by the inverse of its resistance R