Explanation : A solid conductive metal contains mobile, or free electrons, originating in the conduction zone. When a metal wire is connected across the two terminals of H DC voltage source such as a battery, the source places an electric field across the conductor. The moment contact is made, the free electrons of the conductor are forced to drift toward the positive terminal under the influence of this field. The free electrons are therefore the charge carrier in a typical solid conductor. In aqueous solution, these are mobile ions, catious and anions. ....Read more