12-V free energy

In physics, the energy that can accomplish work without requiring further energy input is referred to as free energy. It can refer to energy that is infinitely available from natural sources, including sunlight or wind energy, as well as ideas from thermodynamics that explain how work can be done without using energy. This term can also be used to describe theories that are taken into consideration in the framework of science and engineering with the goal of producing energy in an efficient and environmentally friendly way.