This document presents information about energy. It defines energy as the capacity to perform work, with the SI unit being the joule. It discusses the different forms of energy including kinetic, potential, mechanical, chemical, and nuclear energy. Kinetic energy represents the energy of motion and is measured as one-half mass times velocity squared. Potential energy is stored energy measured as weight times gravity times height. The document also covers the law of energy conservation, sources of conventional energy like coal, oil and gas, and nonconventional renewable sources like solar, wind and biofuels.