Question
Fri May 18, 2012 By:
 

Why does electronic conductance decrease with increase in temparature?

Expert Reply
Sat May 19, 2012
The reason for this very behaviour of metals is explained by the fact that at random, the free electrons moving in a metallic object also collide with the atoms contained in the wire. Due to these collisions, their kinetic energy is wasted to some extent. 
When the temperature of such a metallic wire is increased, their collisions with the containing atoms become more frequent and ultimately more energy is wasted. This obviously reduce their thermal and electrical conductivity.

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