  We extend Feynman's analysis of the infinite ladder AC circuit to fractal AC
circuits. We show that the characteristic impedances can have positive real
part even though all the individual impedances inside the circuit are purely
imaginary. This provides a physical setting for analyzing wave propagation of
signals on fractals, by analogy with the Telegrapher's Equation, and
generalizes the real resistance metric on a fractal, which provides a measure
of distance on a fractal, to complex impedances.
