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    Is this right

    In thermistors e.g. NTC thermistors and semiconductors, increasing temperature causes n to increase in I=nAvq, so resistance decreases with temperature.

    In metals increasing temperature makes vibrations of atoms in the lattice increase, so electrons collide more with the atoms. Hence resistance increases with temperature.

    ??

    It's confusing to know whether a temperature increase causes more collisions between atoms and electrons due to more vibrations of atoms, or if n increases in I=nAvq

    THANKS
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    Temperature causes an increase in resistance, the electrons aren't that effected by temp, they just move with more velocity. The Ions the electrons left behind however start vibrating, this is because they're locked down in a solid structure and cannot move freely. This vibration causes less volume for the electrons to move around in, causing more collisions and an increase in resistance.
 
 
 
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