The first law of thermodynamics can be applied to various energy-based systems, such as power plants, refrigeration systems, and engines. Energy analysis involves calculating the energy input and output of a system, as well as the energy losses and gains.

Thermodynamics is the study of the relationships between heat, work, and energy. It is a fundamental discipline in engineering, as it provides the principles and methods for analyzing and designing various energy-based systems, such as power plants, refrigeration systems, and engines. The book "Fundamentos de Termodinámica Técnica" by Moran and Shapiro is a comprehensive resource for understanding the fundamentals of technical thermodynamics.

Thermodynamic systems can be classified into three main categories: systems, surroundings, and boundaries. A system is a region in space where changes occur, the surroundings are everything outside the system, and the boundary is the surface that separates the system from the surroundings.

The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only converted from one form to another. This law is mathematically expressed as ΔE = Q - W, where ΔE is the change in energy, Q is the heat added to the system, and W is the work done on the system.