Question

Consider the following statements A and B and identify the correct answer
A : Thermistors can have only -ve temperature coefficient of resistors.
B : Thermistors with -ve temperature coefficients of resistance are used as resistance thermometers to measure low temperature of the order of 10K

• A. 1) both A and B are true
• B. 2) both A and B are false
• C. 3) A is true and B is false
• D. 4) A is false, but B is true

Answer 1

The correct option is D 4) A is false, but B is true

Thermistor is a type of resistor who resistance depend upin the temperature, depending upon nature of the temperature coefficient of the resistance, ${\alpha }_T$ thermistors can be Positive temperature coefficient (PTC) thermistors and negative temperature coefficient (NTC) thermistors .

The negative value of ${\alpha }_T$ allow the thermistor circuit to detect minute change in the temperature the use for which it is designed.