Copper wires are generally used for electrical power transmission instead of iron wire because
(A) copper is cheaper than iron
(B) copper is lighter than iron
(C) copper is a better conductor of electricity than iron
(D) copper can take higher power than iron
Correct Answer : copper is a better conductor of electricity than iron
Question Asked : SSC CGL Tier-I (CBE) Exam 2016
Explanation : Copper is generally preferred to electrical power transmission instead of iron because of its high electrical conductivity and low resistivity. The conductivity (in c (S/m) at 20°C) of copper is 5.96 × 107, while that of iron is 1.00 × 107. Among metals, silver has the highest electrical conductivity of 6.30 × l07, but it is not used commonly due to its high cost.
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