Theory of Transfer, Storage and Dissipation of Energy in Circuits

Abstract

Energy transfer accompanying with current is usually described by using Poynting’s vector. Here, combining Kirchhoff’s law, Joule’s law and Slepian’s postulation, we demonstrate that, for the case of a current travels along a wire, component of total energy flow flux parallel to the wire (CTEFFPW) may be equivalently described by using product of current intensity and electric potential (voltage), furthermore, the law of conversion and conservation of energy accompanying with current, which is equivalent to Poynting’s theorem, may be obtained based on circuit method. Noting that product of current intensity and voltage relates to CTEFFPW instead of the electric power, physical meaning of usual definitions of powers adopted in electric power theory are readdressed. Our work may provide possibility to achieve the long-time expectation that power properties of power systems are described on the basis of Poynting’s theorem and Poynting’s vector, and to address the unsolved problems arised in the electric power theory.