Thermistors

• What is the symbol for a thermistor?

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

  Resistance decreases as temperature increases
• What is a common application of thermistors?

  Used in thermostats
• 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
• What is the function of a thermostat?

  Turns devices on or off based on temperature
• How does a thermistor help in cooling a computer?

  Activates a fan when temperature rises
• What happens to the potential difference across a thermistor when the temperature increases?

  Potential difference across thermistor decreases
• What is the effect on the fan speed when the computer gets hot?

  Fan operates at high speed
• What role does a thermistor play in an incubator for premature babies?

  Detects temperature to keep babies warm
• What happens if the temperature falls in an incubator?

  Causes a lamp to turn on and alarm to sound
• Where can you find questions on the use of thermistors?

  In the vision workbook
• What are the key features of a thermistor?

  • Resistance decreases with increasing temperature
  • High resistance at low temperatures
  • Low resistance at high temperatures
• Describe the circuit function involving a thermistor in a computer.

  • Thermistor detects temperature rise
  • High resistance at cool temperatures
  • Low resistance at high temperatures
  • Activates fan for cooling
• Explain the relationship between thermistors and thermostats.

  • Thermistors are used in thermostats
  • They control devices based on temperature
  • Essential for maintaining desired conditions