Why copper wire is used for wiring a house rather than aluminium wires as aluminium has more melting point than copper wire?

let me correct you first, Aluminium has less melting point (659 C) as compared to Copper (1083 C). now coming at the question, aluminium is a good conductor of electricity as compared to copper, but aluminium is more reactive than copper (have a look at the reactivity series). it reacts with the moisture and o2 in the air and forms a rust layer, over the conductor, which forms an insulating layer over the conductor, thus breaking the circuit. and since it has a low melting point, it melts easily at the point of electrical sparking. Whereas copper, even it is not as good conductor as aluminium, is less reactive and melting point is also high, therefore it resists high temperature arising due to electrical leakage or sparking, which makes it first choice over aluminium in household electrical wiring. read less

Since, resistivity of Aluminium is more than the resistivity of Copper, it does not allow the flow of electricity easily. And also the melting point of copper is more than that of aluminium [ in question, it have been mentioned that melting point of aluminium is more than that of copper, which is not correct]. read less