Thermistor and barretter :

Sl.No	Barretter	Thermistor
1.	Barretter has a positive temperature coefficient, i.e., resistance increases with temperature.	Thermistor has negative temperature coefficient.
2.	They are less sensitive.	They are more sensitive.
3.	They need less bias current.	Thermistors need more bias current.
4.	Barretters are usually operated at 100 ohm	Thermistors are operated at 100 ohm to 200 ohm.