A(n) dry cell battery uses “dry” chemicals to produce an electric current that flows through a light bulb. Electrons travel through a closed circuit from the battery’s negative to positive poles. The light bulb changes this energy into heat and light energy. Light moves in the form of waves and can travel through empty space. It is a form of radiation. Inside the bulb, a thin wire called the filament glows. You should never touch batteries that leak because they may be hazardous.