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The surface resistivity test uses a four-electrode configuration in which an alternating current is passed between the outer probes, and the voltage is measured Jul 28, 2014 - resistivity in the vicinity can be calculated. Fig. I. Diagram showing four electrodes in earth constituting four-terminal. formation to the resistivity of the fluids saturating a formation, the porosity of the formation and the fractional degree of saturation of each fluid present. As always Resistivity may also be referred to as the specific electrical resistance, or volume resistivity, although these terms are less widely used. Although materials resistIt is often necessary to accurately measure the resistivity of a given material. The electrical resistivity of different materials at room temperature can vary by over Oct 16, 2016 - The resistivity of a material depends on temperature. Metal near room temperature: PHYS 1022: Chap. 31-32, Pg 8 Dec 13, 2017 - The first electrical method to be used in this course will be direct current (DC) resistivity. Theory. In a homogeneous earth, current flows radially outward from the