What Is The Standard Battery?

  An international standard for measuring electric potential. It was invented by American electrical engineer E. Weston in 1892, so it is also known as Weston battery. The positive electrode of a standard cell is a mercury sulphate electrode, and the negative electrode is a cadmium amalgam metal (containing 10% or 12.5% cadmium). The electrolyte is an acidic saturated aqueous solution of cadmium sulphate, which is actually a saturated aqueous solution of cadmium sulphate and mercury sulphate.