Current distributions on two plane, parallel electrodes embedded in the walls of a flow channel have been calculated for separation distance between electrodes to electrode length ratios of 0.5, 1, and 10. Secondary current distributions were calculated using the linear and Tafel polarization laws. Using the Tafel polarization law, current distributions were calculated at various fractions of the limiting current. In all cases considered, the electrodes are nearly independent of one another if the height to length ratio is ten or more.