MEMS and sensors

Which temperature sensor uses the property that its electrical resistance changes greatly with temperature?

  1. AThermistor
  2. BHall element
  3. CPhotodiode
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Answer: A. Thermistor

A thermistor is made of materials such as sintered metal oxides, and its resistance changes greatly with temperature. NTC thermistors, whose resistance drops as temperature rises, are typical and are widely used to monitor battery temperature and control appliance temperatures.

  • A. Correct. It is a temperature sensor using the temperature dependence of resistance.
  • B. A Hall element detects magnetic fields.
  • C. A photodiode detects light.
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