Essential Chemistry for IGCSE - Electricity And Chemistry (Section 3 - No. 29)
Why are high-voltage power lines generally made of steel-cored aluminum cables?
Aluminum conducts electricity well, and steel adds strength.
Aluminum is cheaper than steel and reduces line weight.
Steel is a better conductor, and aluminum adds flexibility.
Aluminum prevents corrosion of the steel core.
Explanation
Steel core provides strength, and aluminum offers good conductivity.
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