Question

What is thermistor?

Answer 1

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It is the most heat sensitive resistor made from alloys and also from semiconductors whose resistance varies appreciably with the rise in temperature.

Temperature co-efficient of resistance may be positive or negative depending upon its construction. If tem increase with the rise in temperature and if the temperature co-efficient is negative, its resistance will decrease with rise in temperature.

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Answer 2

AnswEr:

Thermistors are resistors whose resistance is dependent upon temperature. These are generally in the form of bends, discs etc. A thermistor can have a resistance of 0.1 $\Omega$ to $\sf{10^7}$ $\Omega$, depending upon its composition.

UsEs:

• These are used to detect small temperature changes to measure very low temperature ( 10 K ). It is seen that a typical thermistor can measure a change in temperature of $\sf{10^{-3}}$ C.
• These are used to safeguard the filament of a picture tube of TV set against the variation of current.
• The temperature control units of industry voltage stabilization.

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