Welcome to the Question and Answer section of AskPhysics. Now you can ask your questions here without waiting for the admin to view and approve your questions.
Welcome to Askphysics Q&A, where you can ask questions and receive answers from other members of the community.

Most popular tags

physics motion

Explain the variation of resistance and resistivity with temperature.

0 like 0 dislike
3,438 views
Explain the variation of resistance and resistivity with temperature and hence define temperature coefficient of resistance and resistivity.
asked Jul 25, 2014 in Physics by sohandash (240 points)

1 Answer

0 like 0 dislike
Resistivity of the metallic conductor increases with increase in temperature 
 
When we increase the temperature of the metallic conductor,its constituent atoms vibrate with greater amplitudes then usual.This results to the more frequent collison between ions and electrons
As a result average time between the two successive collision decreases resulting the decrease in drift velocity
Thus increase collison with the increase in tempearture results in increase resistivity
For small temperature variations ,resistivity of the most of the metals varies according to the following relations
ρ(T)=ρ(T0)[1 + α(T-T0)]        Where ρ(T) and ρ(T0) are the resistivies of the material at temperature T and T0 respectively and α is the constant for given materail and is known as coefficient of resistivity.
 
References:
 
answered Jul 28, 2014 by admin (4,920 points)

Related questions

0 like 0 dislike
1 answer
0 like 0 dislike
1 answer
0 like 0 dislike
0 answers
0 like 0 dislike
1 answer
...