Theorem explains why quantities such as heat and power can fluctuate in microscopic system

The second law of thermodynamics states that the total entropy of an isolated system always tends to increase over time until it reaches a maximum. In other words, disorganization increases without outside intervention. Electrical equipment inevitably heats up as part of the energy is dissipated in the form of heat instead of being used for mechanical work, and objects deteriorate over time but do not spontaneously regenerate.

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