Electrical energy is very common all around us. There is equipment which generates, stores, transfers or consumes electrical energy. For example turbine generators, wiring, batteries and various electrical appliances. Since we use this energy source every day, it is very easy to become complacent regarding safe use of electricity.

An example listed here which we should single out is static electricity. Static charges can be anything from a very small one which a human can easily bear to something as significant as a lightning strike. Static charges can be developed through the transfer of materials or fluids, such as filling a portable container.