thermistors

• what is a thermistor?


  a temperature dependent resistor made of a semi-conductor, thermal energy frees up electrons and increasing temperature decreases resistance.
• practical uses of thermistors


  thermostats control heating systems and there is a thermistor in the thermostat, if resistance falls then temperature goes up, if it rises then the temperature goes down.

  the resistance of LED decreases if light intensity increases.
• thermistors are useful temperature sensors, car engine sensors or electronic thermostats
• in hot conditions the resistance drops, in cold conditions the resistance goes up