In the thermistors lab, as the temperature of the thermistor rises, the output voltage of the circuit

Question

BlackTom AI · Accepted Answer

The question asks how the output voltage changes as the thermistor temperature increases in a typical thermistor-based circuit.
Option 1: falls — This is consistent with a common NTC thermistor in a voltage-divider arrangement where the thermistor is one leg and a fixed resistor is the other. As temperature rises, the NTC thermistor’s resistance decreases. In many divider configurations, a lower thermistor resistance causes less voltage to appear at the output node (e.g., if the output is taken across the thermistor or at the junction connected to the thermistor in a bottom position), so the output voltage decreases. This ties directly to the R–T characteristic of NTC devices: resistance falls with temperature, and in a fixed-divider setup that often translates to a falling output.
Option 2: stays the same — This would imply the resistance or the division ratio is unaffected by temperature, which contradicts the fundamental property of the thermistor: its resistance changes with temperature. Therefore this choice is inconsistent with how thermistors behave in a circuit.
Option 3: rises — If the thermistor’s resistance decreases with temperature, the specific voltage at the output in a given divider could rise only if the output is taken in a way that increases with the bottom resistor's drop or with the top resistor seeing more of the supply. However, with the typical wiring used in thermistor labs (thermistor in one leg of the divider and the output taken at the junction to ground or across the thermistor), a temperature rise generally leads to a lower output voltage, not a higher one. This makes this option incorrect for the standard configuration.
In summary, given the common thermistor-in-a-voltage-divider setup and the fact that an NTC thermistor’s resistance decreases as temperature increases, the output voltage is expected to fall as temperature rises, making the other two statements inconsistent with standard behavior.

In the thermistors lab, as the temperature of the thermistor rises, the output voltage of the circuit 单项选择题

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