Question

For which metals, the resistance decreases on
increasing the temperature and why
Metal Name?

Answer 1

Answer: The electrical resistance in a metal is due to a sea of electrons, the electron sea doesn’t have an intrinsic temperature dependence, however if you make apiece of metal longer, the resistance increases, because basically the electrons have to go further. All “pieces of metal” get longer as temperature increases this is known as the linear temperature coefficient of expansion or just CTE for short. All metals have a positive CTE on average. Some alloys can have nearly zero CTE, like Invar - Wikipedia (and some Invar alloys can have a small negative CTE over some temperature range, hence a nega … (more)