Electricity is a form of energy involving electrons, protons, and neutrons that exists in three main types: direct current, alternating current, and static electricity. Direct current flows in one direction while alternating current oscillates back and forth as used in homes. Electricity was first discovered by the Greeks over 3,000 years ago and now travels through homes via electrical cables. To keep a home safe from electricity, outlets should have child covers, damaged cords replaced, and cords kept away from water. Dangers include standing in water or near metal during storms, and how to avoid them is to stay away from water and metal during storms and tall structures.