Due to what is current formed in an electrolyte?

$A$ steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are:

$A$ steady current $i$ is flowing through a conductor of uniform cross-section. Any segment of the conductor has

$5 \, A$ of current is passed through a metallic conductor. The charge flowing in one minute in coulombs will be:

Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is

Define electric current when there is no steady flow of charge.