Potential profiles of continuous electrolyte phase and dispersed particle phase were measured in a fluidized bed electrode reactor of rectangular geometry. The reactor with solid copper particles（0.5 ㎜ in diameter） was used to deposit copper from acidified aqueous solutions (0.1 M and 1 M H₂SO₄) containing 0.032M of copper. Effective specific electrical conductivities of individual phase could be calculated from the potential profiles.
Results showed that the effective specific electrical conductivity of continuous electrolyte phase was inversely proportional to the 3.0 power of the bed porosity and proportional to the electrolyte specific electrical conductivity, the effective specific electrical conductivity of the dispersed particle phase was inversely proportional to the 12.0 power of the bed porosity, and the overall（or equivalent） electrical conductivity of the bed was inversely proportional to the 6.8 power of the bed porosity.