The word "mho" is often used as a synonym for conductance, a measure of how easily electric current flows through a material. This unit is named after physicist Georg Simon Ohm, who discovered Ohm's Law relating current, voltage, and resistance. Although "mho" is now considered an obsolete unit, it's still occasionally used in educational settings. Synonyms for mho include Siemens, after electrical engineer Ernst Werner von Siemens, who helped develop the metric system, and inverse ohms, which represent electrical resistance. Other synonyms for mho include reciprocal ohms, conductances, and admittances.