Question

why do we use copper and not silver or graphite for electrical wiring in our houses give a reason for each

Answer 1

Silver costs more than 80 times as much as copper by weight and is only a couple of percent or so better conductor. It is much, much, much cheaper to use a little more copper than a few percent less silver.

Unlike silver which in its natural state is a metal like copper, the form of graphite with very low resistivity to compare with copper is graphene. Technically its not a metal which can be extruded into wires but a few atoms thick crystallene structure that would be difficult to manufacture and use for wiring. It’s just not a practical substance to work with for wiring.

Answer 2

Silver costs more than 80 times as much as copper by weight and is only a couple of percent or so better conductor. It is much, much, much cheaper to use a little more copper than a few percent less silver.

Unlike silver which in its natural state is a metal like copper, the form of graphite with very low resistivity to compare with copper is graphene. Technically its not a metal which can be extruded into wires but a few atoms thick crystallene structure that would be difficult to manufacture and use for wiring. It’s just not a practical substance to work with for wiring.