energies

Energy is the ability to do work or cause change. It exists in various forms, such as heat, light, motion, or stored in objects like batteries or fuel. When energy is used, it often transforms from one type to another, like chemical energy in food turning into movement or heat. Although it can be transferred, the total amount of energy in a closed system remains constant, a principle known as conservation of energy. Understanding energy helps explain everything from how machines operate to how the universe functions.