Current will be generated when two dissimilar metals are electrically connected and immersed in an electrolyte. One of the metals will corrode. The path of the current will be from the corroding metal, through the electrolyte (soil) to the non-corroding metal and then back through the connection (conductor) between the two metals. The corroding metal is the one where the current leaves to enter the electrolyte and is called an anode. The metal that receives the current is called the cathode.
Source:www.bushman.cc/pdf/corrosion_theory.pdf
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