thermistors

• Thermistor


  A type of resistor whose resistance decreases as temperature increases
• As temperature increases


  Resistance of a thermistor decreases
• Applications of thermistors


  • Thermostats
  • Computers (to control fan speed)
• How a thermistor controls a fan in a computer

  1. At low temperatures, thermistor resistance is high so fan runs at low speed

  2. At high temperatures, thermistor resistance is low so fan runs at high speed to cool the computer
• Other applications of thermistors

  • Incubators for premature babies (to detect temperature and turn on heating)
• Thermistors are extremely useful devices