International Electrical Unit System

The US electrical engineers used this international system of electrical units which was adopted internationally until 1947 when it became obsolete and was replaced first by the MKSA and then by SI. The base units of this system is given in Table 1.

Table 1 - The basic units of International Electrical Units System

ampere	One ampere is equal to the unvarying electric current intensity which deposits, in one second, by electrolysis from an aqueous silver nitrate solution, \(0.00111800\) [g] of silver metal at the cathode (IEC, 1881)
ohm	One ohm is equal to the electric resistance, measured at the temperature of melting ice (0°C), of a mercury column of \(106.300\) [cm] length which has a mass equal to \(14.4521\) [g] (IEC, 1908)
volt	One volt is equla to the electromotive force (e.m.f.), measured at 20°C, of a Weston electrchemical cell. It is equal exactly to 1.0183 int. volt (IEC,1908)