thermistors

• How does the resistance of a thermistor change with temperature?

  Resistance decreases as temperature increases
• In which devices are thermistors commonly used?

  Thermostats
• What are the characteristics of light dependent resistors (LDRs)?

  • High resistance in dark conditions
  • Low resistance in light conditions
  • Used in devices like garden lamps
• What happens to the resistance of a thermistor at low temperatures?

  Resistance is very high
• What happens to the resistance of a thermistor at high temperatures?

  Resistance falls to a low level
• How do thermistors function in cooling systems like computers?

  They control fan speed based on temperature
• What occurs in a computer circuit when the temperature rises?

  Resistance of the thermistor falls
• What is the effect of high resistance in a thermistor on the fan speed?

  Fan operates at low speed
• What happens to the potential difference across the thermistor when the temperature rises?

  Potential difference across thermistor decreases
• What happens to the potential difference across the fan when the thermistor's resistance decreases?

  Potential difference across fan increases
• What are some applications of thermistors as thermostats?

  • Cooling fans in computers
  • Incubators for premature babies
  • Temperature control systems
• How does an incubator for premature babies use a thermistor?

  It detects temperature drops to activate alarms
• What happens when the temperature in an incubator falls?

  Alarm sounds and lamp turns on