This paper describes a technique for simulating the neutron diffusion equations by an electrical analogy of a transmission line. The analog may be constructed for single or multienergy groups in one, two, or three dimensions. This paper presents examples of one-dimensional systems studied by one-group and by two-group theory. The technique is considered to be especially useful for the instruction of students because it enables them to obtain an insight into the characteristics of the solution and to gain an appreciation of the factors which affect the results.