Why are the pins on a plug made of brass not copper?

Answer 1

because brass is generally tarnish resisant so it does not discolours easily and also because brass is not such expensive as copper

<<>>

The pins are make of brass because it is a harder metal than copper and will wear better through use over its lifetime.

Answer 2

possibly because copper is more expensive.

some electrical prongs are just coated. Copper is too soft and the prongs would bend and become a hazard. Plus copper is more costly.

Answer 3

Brass is adequately conductive for electricity, and physically stronger than copper would be. [And cheaper as well]

Answer 4

Brass is harder wearing, so will not alter its shape. However, the copper is the better electrical conductor.