Comparison between copper and aluminium conductor

Materials made of metals will possess the property of electrical conductivity. An electrical conductor allows electric charge to flow through it. Silver is the most electrically conductive element. It is followed by Copper, Gold, Aluminum, Zinc, etc.

Aluminium & Copper properties

Property Copper (Cu) Aluminium (Al)
Conductivity (s/m) at 20 °C 5.96×107 3.5×107
Resistivity (Ω m) at 20 °C 1.68×10−8 2.82×10-8
Density (g/cm3) 8.96 2.70

 Copper Conductors

copper conductors, copper wires, copper cables

  • The density of the copper is higher than aluminium. Hence it is heavier compared to aluminium conductors it requires strong structures and hardware to bear the weight.
  • More ductile and has high tensile strength. So, it is able to make thin wires and it can manage a high amount of stress.
  • High cost.
  • Good conductivity.
  • Low resistivity.

Aluminium Conductors

aluminium cables, aluminium conductors, aluminium wires

  • Less in weight.
  • Low cost.
  • Less in conductivity.
  • More in resistivity.


1. Which is a better conductor aluminium or copper?

Ans:- The answer is simply copper.

2. Why is aluminium used in transmission lines?

Ans:- Due to its advantage of low cost and less in weight.

Even the copper has 1.7 times conductivity than aluminium conductors, it weights 3.3 times heavier than aluminium. Hence aluminium conductors can considerably reduce the weight for the same amount of power loss compared to copper.

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