World Journal of Engineering Research and Technology

Dr. Yefim Berkovich*

ABSTRACT

The paper gives an analysis of the basic definitions and manifestations of entropy processes in thermodynamics, mechanics and electrical engineering. As is well known, the concept of entropy for the first time was introduced as a function of state in thermodynamics. The definition of the concept for classical mechanics was introduced in the late 1990s. As concerns the exposition of various manifestations of entropy in electrical engineering and making comparisons with already known entropy definitions in other scientific fields is given in thepresent paper and was considered in some earlier publications of this author. This paper gives a brief overview of entropy in the former two scientific fields, while as concerns electrical engineering, it dwells on its justification and manifestations. It has been shown that the energy basis of entropy in electrical engineering is the reactive power of a circuit or device, and the entropy there has a negative sign, and is manifested as negentropy (information). During the operations of the magnitude of reactive power, we made comparisons of its different definitions for non-sinusoidal currents, ad as concerns further operations, we took the most adequate of its definitions, and we were able to prove that. Since entropy is always striving to reach an extremum – minimum or maximum – the paper and foremost proves that the basic quantity of electrical entropy, that is, the reactive power, is always striving to reach the minimal value defined by the voltages and currents found by Kirchhoff’s equations. As a result, we defined the electrical entropy as the time-dependent density of reactive power. In comparison with the thermodynamic entropy, for the electrical entropy (negentropy) the role of the quantity of energy is played by the reactive power, the role of temperature, by the duration of the period of electrical current. Due to the action of negentropy, the necessary operating mode is established in an electrical device and its orderly character is being ensured. The specific examples of the transitions of devices into less probable states are given in the author’s other publications.

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