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Materials and Components

Q1:

The temperature coefficient of a thermistor

A is positive

B is negative

C zero

D may be positive or negative depending on its composition

ANS:B - is negative

A thermistor is a type of resistor whose resistance is dependent on temperature, more so than in standard resistors. The word is a portmanteau of thermal and resistor. Thermistors are widely used as inrush current limiter, temperature sensors (Negative Temperature Coefficient or NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements. (Positive Temperature Coefficient or PTC type typically).



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