Question

why are Copper and Aluminium wires usually employed for electric energy transmission

Answer 1

Because they are cheap and are available in large quantities also the conduct electricity better than the metals in their category.

Answer 2

Copper and Alumnium wire are usually employed for electric transmission as they are good conductor of electricity and have very less resistance to the flow of electric current. Also, they are cheaply available in the market which is also cost efficient.
Hence, for these reasons, copper and Aluminium wire are usually employed for electric energy transmitted.
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