The 2nd law of thermodynamics can yield predictions on the maximum efficiency of a process that seeks to extract useful energy. An example would be the Carnot cycle which gives the maximum percent of energy that can be harvested and turned into useful work as heat moves from a heat source to a heat sink.
You didn't specify what you mean with "the following".To the best of our knowledge, conservation of energy ALWAYS applies. There are no known cases when you can create energy out of nothing, or simply make it disappear.
Thermodynamics.
Thermodynamics is part of physics.
Thermodynamics is the study of relationship of heat with other kinds of energy such mechanical, electrical, or chemical energy.
Conservation of energy is the 1st law of thermodynamics.
That law is known as the Law of Conservation of Energy. It is also known as the First Law of Thermodynamics.
According to the second law of Thermodynamics, the amount of usable energy will continuously decrease.According to the second law of Thermodynamics, the amount of usable energy will continuously decrease.According to the second law of Thermodynamics, the amount of usable energy will continuously decrease.According to the second law of Thermodynamics, the amount of usable energy will continuously decrease.
The Law of Conservation of Energy, also known as the First Law of Thermodynamics.
The 1st Law of thermodynamics is a restatement of the law of conservation of energy.
That applies to energy in general.That applies to energy in general.That applies to energy in general.That applies to energy in general.
Thermodynamics is the branch of science that deal with relations between all forms of energy and power.
The First Law of Thermodynamics.