The objective of the paper was to determine the selected electric properties of potato tubers in the context of their biometric features. The research was carried out in 2011-2012 in laboratory conditions. Early cultivars of potato tubers constituted the research object: Arielle, Lord and Denar. Subsequent biometric features of tubers were covered by the research: length, thickness, width and weight. Based on biometric features, subsequent coefficients of tubers shape were listed: coefficient of elongation, coefficient of flatness and weight coefficient of dimension. The following electric properties of a tuber were measured: voltage and strength. The result of analysis of variance concerning the impact of potato cultivars accepted for the experiment on the value of voltage and stregth was significant. The research results indicate that all biometric features of Lord and Denar potato tubers significantly influenced the investigated dependent variables. In case of Arielle cultivar, no significant impact of the coefficient of elongation on the intensity and coefficient of flattening on voltage was determined. A strong correlation relation between the measured electric voltage and strength in potato tubers was reported.