Q.No.13.4: - Why does the resistance of a conductor rise with temperature?

Q.No.13.4: - Why does the resistance of a conductor rise with temperature?

Ans: - Electrical resistance is due to the collision of free electrons with atoms of the conductors. Atoms in the conductors are in vibratory motion when electrons collide with atoms they transfer some of their energy to the atoms and atoms starts vibrating with larger amplitude as the amplitude of vibration increases the probability of collision of electrons also increases. As a result increases resistance. When temperature increases then also amplitude of vibration increases and then probability of electrons collision also increases and then increases resistance.