Why do conductors have positive temperature coefficient of resistance?

Hence conductors have value of temperature coefficient as positive. The negative temperature coefficient materials are semiconductors whose resistivity decreases with increase in temperature. Conductors are positive temperature coefficients because their resistance increases with the increase in the temperature.

In this regard, how does resistance change with temperature?

Surely, upon an increase in temperature, the atoms within the thermistor would vibrate with more energy and therefore more vigorously, hence making the electrons flowing through the electric circuit more likely to collide with one of the atoms, so increasing resistance.

What is the effect of temperature on the resistance of a conductor?

Resistance increases, in case of conductor, with increase in temperature and decreases, in case of insulator, due to increase in temperature. In case of conductor, the valance band and conduction band overlap with each other. So, there are excess electrons in the conduction band of a conductor.

How does a PTC resistor work?

There are two types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases. A PTC thermistor works a little differently.
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