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Material Resistivity Reference Notes. (% IACS) (See (Siemens/m) (Ohm-m) Endnotes) Iron. Iron 18.00 1.044E+07 9.579E-08 ECTM. Iron Ingot (99.9% Fe) 15.60 9.048E+06 1.105E-07 CSNDT.
At room temperature, copper has a resistivity of 16.78 nÎ©m. From the above equation, it can be seen that as the thickness and, thus, the cross-sectional area A of the wire increases (for the same length l) the resistance will decrease because of the reciprocal effect upon the value of R as A increases in size.However, this is not the full picture. '..hat is the relationship between wire thickness affecting resistance and 1/r1+1/r2=1/rTotal? i am confused.?