Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

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When the temperature of a negative temperature coefficient (NTC) thermistor increases, what happens to its resistance?

  1. It increases

  2. It decreases

  3. It stays the same

  4. It fluctuates

The correct answer is: It decreases

A negative temperature coefficient (NTC) thermistor is a type of resistor whose resistance decreases as the temperature increases. This characteristic is crucial for temperature sensing and control applications within HVAC systems. When the temperature rises, the material properties of the thermistor alter, which allows more current to pass through it, resulting in a decrease in resistance. This behavior is utilized in various temperature measurement and compensation circuits, making NTC thermistors valuable in regulating HVAC operations for optimal performance and energy efficiency. Understanding the relationship between temperature and resistance in NTC thermistors is essential for accurately interpreting temperature readings and making informed adjustments in HVAC systems.

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