The Plasma resistivity has been measured in the edge plasma of IR-T1 tokamak. The fundamental plasma parameters of electron temperature (Te) and electron density (ne) are measured simultaneously for calculating the radial profile of vertical and parallel resistivity using IV characteristics of a moveable single Langmuir probe. Since the effective charge (Zeff) and Te together define the plasma resistivity, Zeff considered for resistivity measurement in Spitzer model. The results have shown that electron density increased from edge to core of plasma column, as the parallel electrical resistivity of the plasma decreases with increasing temperature. As temperature of plasma raised, resistivity drops rapidly so Reduction of resistivity with increasing temperature could leads to prolonging of the duration of the plasma discharge.

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