Thermodynamics and Statistical Mechanics

# How does energy efficiency relate to the first and second law of thermodynamics?

By the first law of thermodynamics, energy is conserved - i.e. the sum of the useful work and the energy lost to heat will equal the energy you started with.

The second law states that you will never get 100% energy efficiency.

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## Related Questions

As stated by the expert: The First Law of Thermodynamics IS the Law of Conservation of Energy. The Second Law of Thermodynamics is not directly related; however, it provides additional restrictions, as to what can, and what cannot, be achieved.

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.

A heat engine of 100 percent efficiency violates the second law of thermodynamics and is impossible even in theory.

Because Energy flow is from a high energy state to a low energy state the direction of flow of heat is from a high temperature to a low temperature. Because the second law states that no system can perfectly maintain it's total energy, the efficiency of a heat engine must necessarily be reduced by the entropy of the energy transfer.

The first and second laws apply EVERYWHERE, including ecosystems. Specifically, living beings need energy - and that means, usable energy - to live.

Due to the second law of thermodynamics, even "renewable" energy yields a net release of heat to the surroundings. An advantage of renewable energy is that it can be a predictable, sustainable source of energy as opposed to fossil fuels extracted from the ground which apparently take millions of years to create through geological processes.

According to the Second Law of Thermodynamics, once energy is wasted, it is gone forever - useful energy has become unusable energy.According to the Second Law of Thermodynamics, once energy is wasted, it is gone forever - useful energy has become unusable energy.According to the Second Law of Thermodynamics, once energy is wasted, it is gone forever - useful energy has become unusable energy.According to the Second Law of Thermodynamics, once energy is wasted, it is gone forever - useful energy has become unusable energy.

The second law of thermodynamics forbids a 100%-efficient solar cell. The result is, for a system with sunlight concentration the maximum efficiency is ~85%, and for a system that does not track the sun, the maximum efficiency is ~55%.

No system can convert energy from one form to another useful form with 100% efficiency. and Entropy of a system increases over time.

You must be referring to the two Laws of Thermodynamics. Stated in terms of energy: 1. The First Law of Thermodynamics is the Law of Conservation of Energy, meaning that energy can not be created or destroyed. 2. However, useful energy is continuously being converted into unusable energy. This is irreversible. This is the Second Law of Thermodynamics.

Entropy of a system increases over time,No system can convert energy from one form to another useful form with 100% efficiency.

First Law of Thermodynamics is also known as Conservation of Energy. Second Law of Thermodynamics means that useful energy is continuously being converted into unusable energy - there are irreversible processes in our Universe, with respect to energy. Read the Wikipedia articles for a more thorough discussion.

The Second Law of Thermodynamics is equivalent to the Law of Conservation of Energy. The Law of Conservation of Matter is not stated in the laws of Thermodynamics.

Efficiency can never be greater than one because it is the ratio between work you got out of the system and the total energy. Because of conservation of energy, the equation &Delta;E = Q + W reduces to Q + W = 0.

The Second Law of Thermodynamics applies to all processes in our Universe. It is not restricted specifically to food. In any process, the amount of unusable energy will increase. In extreme cases it might remain unchanged, but this is rather unlikely, since this implies 100% efficiency.

The second law of thermodynamics states that a system with no energy input and no energy losses will tend toward dissolution.

The 2nd law of thermodynamics basically states that there is always increasing entropy in the universe. Although the total quantity of energy is conserved, there is always a breakdown of useful energy into less useful forms. Usable energy, when processed, turns into a less efficient form. Entropy is the measure of unusable energy in a closed system, so therefore, entropy is increasing (2nd law). As for the efficiency of power plants, that depends on the type. Coal-burning power plants have between 32 % to 42 % efficiency, natural gas fired ones have 32 % to 38 % efficiency, and nuclear power plants only have 0.27 % efficiency.

Law of thermodynamics deals with the heat energy involved in a reaction. According to second law of thermodynamics, the energy system tries to increase the entropy. The entropy is a measure of chaos of molecules.

Quite simply, just like anything else, cells need energy to work. The energy can't be created out of nothing (First Law), and usable energy gets converted to unusable energy, therefore new energy sources must be found (Second Law).

The Second Law of Thermodynamics states that "in all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state." This is also commonly referred to as entropy.

Since energy can't be created nor destroyed (First Law of Thermodynamics), a loss or waste of energy really means that useful energy is converted into unusable energy (Second Law of Thermodynamics).

There is no commonly accepted law by that name, as far as I know. Two important laws about energy are the First Law of Thermodynamics and the Second Law of Thermodynamics.

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