The existence of an electric analog of a magnetic circuit established by the basic laws defining magnetostatics

Equivalent circuits have been established by Kron and others who used finite-difference and integral forms of Maxwell´s equations and equations of mathematical physics in general, and in many cases applied them to actual problems in obtaining solutions. Examples of application are to problems of compressible and incompressible fluid, electromagnetic fields, elastic fields, and heat flow. See references 1 through 19.