Ohm

The standard unit in the measure of electrical resistance being the resistance of a circuit in which a potential difference of one volt produces a current of one ampeacutere As defined by the International Electrical Congress in 1893 and by United States Statute it is a resistance substantially equal to 109 units of resistance of the C G S system of electro magnetic units and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice 144521 grams in mass of a constant cross sectional area and of the length of 1063 centimeters As thus defined it is called the international ohm