The element Volta represented the high column made of metal circles - copper zinc, divided by the cardboard linings moistened with a solution of alkali or table salt.
Occurrence a column has sharply changed character of all subsequent experiences. It has been finalised that on wires the electric current, capable to make certain work can flow.
In 20 years after the invention Volta the Danish physicist has found out magnetic action of an electric current on a compass arrow. This opening often result as a typical example of casual opening. And business was so. In 1820 Ersted showed to students experiments on an electricity. Near to a wire on a laboratory table there was not having any relation to experience a compass. One of students has paid attention of the professor that when the current joins, the arrow of a compass, shudders and turns. At deenergizing of a current it again comes back in a starting position.