The one-dimensional variable range hopping conductivity model(1-3) was applied to a very simple model system, monodispersed hard spheres suspended in an insulating oil, to understand dynamic-field-induced de current oscillation phenomenon that was experimentally observed in the electrorheological fluid,(1,4) a typical colloid crystallite arrayed with an external electric field. The relationship between the oscillatory de current and the applied mechanical field is established, agreeing well with previous experimental results. Our finding suggests that this kind of colloidal crystal can be potentially used as a convenient electronic device to mutually transfer electronic and mechanical signals or to real-time analyze mechanical signals, which would be useful in mechanical measurement, such as in seismographs.