It is shown that the methods of operational circuit analysis may be extended to give the steady state current of a circuit not only in the well‐known Fourier series form but also in the form of the sum function of this Fourier series. This sum function is very useful in determining the wave form of the current. Three methods of obtaining the steady state current are given along with their restrictions, and these methods involve a real integral, a finite series, and a complex integral. An example of the use of these methods is also given.