Energy appears in many forms and can produce movement or light. There are five main forms of energy: thermal, nuclear, chemical, light, and electrical. Thermal energy is used for heating in ovens and homes, nuclear energy powers plants, chemical energy fuels airplanes, light energy is used in computers, and electrical energy powers fans, drills, and televisions. Some forms of energy like wind, solar, hydroelectric, and biofuels are renewable, while other forms like coal, natural gas, uranium, and petroleum are limited.