LAW OF CONSERVATION OF ENERGY

LAW OF CONSERVATION OF ENERGY Energy, Work, and Power CP-05 Page 6 Rev. 0 LAW OF CONSERVATION OF ENERGY Energy does not simply appear and disappear. Energy is transferred from one position to another or transformed from one type of energy to another. EO 1.4 STATE the First Law of Thermodynamics, "Conservation of Energy." Conservation of Energy The First Law of Thermodynamics is simply stated "energy cannot be created or destroyed, only altered in form." In the previous chapter, we discussed potential energy, where a force is applied to an object, raising it from some point of origin to some height. The energy expended in raising the object is equivalent to the potential energy gained by the object because of its height. This is an example of a transfer of energy as well as an alteration of the type of energy. Another example is throwing a baseball. While the ball is in your hand, it contains no kinetic energy. You apply a force to the ball by throwing it. The ball leaves your hand with a velocity, giving it kinetic energy equal to the work applied by your hand. Mathematically, this can be described by the following simplified equation. Energy + Energy - Energy = Energy (5-4) initial added removed final where: Energy is energy initially stored in an object/substance. This energy can exist in initial various combinations of kinetic energy and potential energy. Energy is energy added to the object/substance. Heat can be added. Energy can be added added in the form of stored energy in any mass added, such as water to a fluid system. Work can be done on a system. Heat is energy gained or lost at a microscopic level. Work is the same at a macroscopic level. Energy is energy removed from an object/substance. Heat can be rejected. Work removed can be done by the system. This energy can be in the form of energy stored in any mass removed. Energy is energy remaining within the object/substance after all energy transfers and final transformations occur. This energy can exist in various combinations of kinetic, potential, flow, and internal energy.