Why overhead electric cables are made of aluminium and not copper ?

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Solution

1.For equal lengths and resistance aluminium wire is lighter than copper wire, so due to lesser mass it is used as overhead cables .
2.Aluminium is more malleable and ductileducti copper, so it is easier to make it into wires
3.Aluminium is less expensive than copper.

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Q. Assertion : Electrical cables are made up of aluminium or copper wires Reason: Copper and aluminium are good electrical conductors.

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Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables. (ρ_Al = 2.63 × 10⁻⁸ Ω m, ρ_Cu = 1.72 × 10⁻⁸ Ω m, Relative density of Al = 2.7, of Cu = 8.9.)

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Why overhead electric cables are made of aluminium and not copper ?

1.For equal lengths and resistance aluminium wire is lighter than copper wire, so due to lesser mass it is used as overhead cables . 2.Aluminium is more malleable and ductileducti copper, so it is easier to make it into wires 3.Aluminium is less expensive than copper.

1.For equal lengths and resistance aluminium wire is lighter than copper wire, so due to lesser mass it is used as overhead cables .
2.Aluminium is more malleable and ductileducti copper, so it is easier to make it into wires
3.Aluminium is less expensive than copper.