According to what does the resistance of a thermistor change?

According to what does the resistance of a thermistor change?

• A. The color of walls.
• B. The size of the room.
• C. The surrounding air temperatures.
• D. The brand of thermostat.

Answer: (C)

Thermistors are temperature-sensitive resistors. Their resistance changes as the surrounding air temperature changes, which is why control systems read temperature from them. In HVAC sensors, most thermistors are of the NTC type, meaning resistance decreases as temperature rises. The surrounding air temperature is the direct factor that alters the sensor’s resistance. Things like wall color, room size, or the thermostat brand don’t change the thermistor’s intrinsic resistance, though placement or heat from nearby objects can affect readings.

Thermistors are temperature-sensitive resistors. Their resistance changes as the surrounding air temperature changes, which is why control systems read temperature from them. In HVAC sensors, most thermistors are of the NTC type, meaning resistance decreases as temperature rises. The surrounding air temperature is the direct factor that alters the sensor’s resistance. Things like wall color, room size, or the thermostat brand don’t change the thermistor’s intrinsic resistance, though placement or heat from nearby objects can affect readings.