May 05, 2015 · The conservation of energy is a fundamental concept of physics along with the conservation of mass and the conservation of momentum.Within some problem domain, the amount of energy remains constant and energy is neither created nor destroyed. In the context of electromagnetic power flow, it is Poynting theorem - that represents conservation principle, and as such this theorem is o fundamental significance. The f Poynting equation was derived by Poynting in the year 1884; later in the same year Heaviside too derived the same equation [1]. Dec 03, 2019 · E= m c² , energy can be converted into mass and mass can be converted to energy. Pair production is an example of the conversion of energy into mass. On the other hand, nuclear fission and nuclear fusion are examples of the conversion of mass into energy. Conservation of Energy formula. Total energy = kinetic energy + potential energy