How resistance can vary with temperature?

Question

How resistance can vary with temperature?

Answer 1

if the temperature is not too high, the resistance will go down, because the electrons will have more energy to move.

but if the temperature is high, the resistance will go up because the atom will vibrate more, blocking the electron pathway..

Answer 2

Heat increases resistance - pretty much across the board.

Answer 3

The resistance of ordinary materials usually increases with temperature. See the reference for details...