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Earth's Resistance

August 10th Fact-of-the-Day

The earth's DC resistance in a circuit where the earth constitutes one of two conductors is essentially zero ohms, because the specific resistance of the material of the earth, whatever it may be, is made negligible by the earth's size. For example, if the DC resistance of a loop consisting of a transatlantic cable and earth is measured, all the DC resistance is accounted for in the copper cable conductor and zero ohms in the earth as a conductor. The earth even constitutes a DC short-circuit shunt of the large steel armor wires in contact with the sea. ©2004 Martek International All rights reserved.


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