ABSTRACT
A material must contain charged particles to be able to conduct electric current. In solids, the current is carried by electrons. Copper, lead, aluminium, iron and carbon are some examples of solid conductors. In liquids and gases, the current is carried by the part of a molecule which has acquired an electric charge, called ions. These can possess a positive or negative charge, and examples include hydrogen ion HC, copper ion CuCC and hydroxyl ion OH. Distilled water contains no ions and is a poor conductor of
electricity, whereas salt water contains ions and is a fairly good conductor of electricity.
