Question

why does the resistance of a wire increases when we increase the temperature

Answer 1

hey see when we increase d temperature the electrons in the wire gets collided with each other and then heat energy is got from them that is why the resistance increases

Answer 2

as temp is increased positive kernels also start vibrating so electrons go through a lot more collisions.Therefore their movement tend to become more random.i.e not in direction opposite to electric field inside the material.hence resistance increases. this is valid for normal conductors

Answer 3

with semi conductors resistance varies diffently with temperature.

Answer 4

When a material is in an excited state, like a conductor in a wire that is very hot, it is essentially less organized at the molecular level. There is less chance for normal, orderly collisions within the valence shell of the atom.