How does temperature effect resistance?

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[Annafofinha]

Great video! Short and straight to the point.

[rosetinman]

Oh my goodness; that actually makes sense!

[qwiickk]

Hello. Awesome video. It seems to describe the inner workings of a PTC thermistor. Can you explain how the same physics would apply to a NTC thermistor where resistance decreases with an increase in temperature? Please advise. Thanks! Happy New Year!

[ambraich]

How would you write an answer explaining how temperature affects resistance/current?