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Copper wires are generally used for electrical power transmission instead of iron wire because :
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- copper is cheaper than iron
- copper is lighter than iron
- copper is a better conductor of electricity than iron
- copper can take higher power than iron
- copper is cheaper than iron
Correct Option: C
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity. The conductivity (in s (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 6.30×107, but it is not used commonly due to its high cost.
