A physical property of matter is its ability to carry electricity.  This is known as conductivity.  Certain matter is more conductive than others, normally matter with many free electrons are good conductors, such as metals and ions.  You know this, because most of you have seen the wire that is used in most electrical equipment, not only that, but you also know that wood is not used to carry electricity from one source to another.  Ions are good conductors also, the water in the bath tub is a good example.  Most tap water has many impurities in it, including a lot of free floating ions.  These ions are great for carrying and conducting the electricity that might be in a radio that you have near the water.  If this radio where to fall in the tub, and for some reason have a frayed wire, the water would give the electricity a medium to spread through the water.

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