Question

why are copper and aluminium wires usually used for electricity transmission​

Answer 1

Because copper and aluminium wires have more conducting nature and less resistivity.

Answer 2

The reason why we use copper and aluminum are as follows:

• The first & foremost reason for using copper & aluminium wires for transmission of electric current is - both Cu & Al are good conductors of electricity. That is they don't offer much resistance to the flow of electricity.
• both metals are very ductile rendering them to be drawn into thin wires .
• both metals care relatively cheap among the conducting metals.
• both can be coiled for transportation & sent over long distances for their use.

hope it will help you........