What is energy?
Energy is work. Energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary.
Energy is subject to the law of conservation of energy. According to this law, energy can neither be created (produced) nor destroyed by itself. It can only be transformed.
Energy is subject to the law of conservation of energy. According to this law, energy can neither be created (produced) nor destroyed by itself. It can only be transformed.