Discussion
A thermistor differs from a resistance temperature detector in that it
Answer: B
Correct answer: Has a large non-linear change
A thermistor is a semiconductor, and its resistance changes far more steeply with temperature than a metal's - typically several per cent per degree against 0.4 for platinum - but the relation is strongly non-linear, roughly exponential.
The trade is sensitivity against linearity and range. A thermistor gives a large signal over a narrow band, which suits monitoring around a set point; an RTD gives a smaller but linear signal over hundreds of degrees. Both are passive and both need excitation.
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