ERSC 3V93 Lecture Notes - Lecture 36: Inductance, Magnetotellurics, Electrical Network
3 May 2016
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Document Summary
Measure subsurface electrical properties by injecting current into ground or measuring natural electrical currents resistivity = property of a material that resists the flow of electrical current. Measure electrical potentials (voltage) in ground using set of electrodes to determine resistivity of subsurface otential generated by injecting current (d. c. ) or measuring naturallyoccurring electrical potentials (self potentials) Resistance, r resistance to movement of charge. Capacitance, c ability to store charge. Inductance, l ability to generate current from changing magnetic field. Each electrical property is basis for a geophysical method: Resistivity measures apparent resistance of ground to direct current (dc) injected into ground. Induced polarisation (ip) measures charge storage (capacitance) in ground. Spontaneous potential (sp) measures naturally occurring dc currents - produced by groundwater flow and magneto telluric effects. Current i rate of flow of electrons through circuit - measured in amps. Voltage v measure of potential energy of electrons to create current flow units of volts a. k. a. potential difference.
