Structural fluctuations Δ_E~2 (in the squares of the electric field strength) and Δ_j~2 (in current density) averaged over the sample volume, are considered in various inhomogeneous conducting systems. Explicit expressions are obtained for Δ_E~2 and Δ_j~2 in the case of a weakly inhomogeneous medium as well as in an approximation linear in one of the components. The critical behavior of quantities Δ_E~2 and Δ_j~2 for a system with the metal-insulator phase transition is considered in the framework of the standard phenomenological similarity hypothesis. Structural fluctuations are determined and tabulated in the course of a numerical experiment on disordered lattices in a wide range of variation of the parameters of the problem.
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