GCSE physics question circuits

Please could I have help on this question: explain how the reading on the voltmeter changes when the temperature of the room decreases.

I thought that as temperature decreases, the resistance of the thermistor increases so the voltage across it decreases therefore the voltage in the voltmeter will increase because the total voltage is constant in the circuit?
Yet the markscheme says something different. Thanks!!

Is the voltmeter measuring the voltage across the thermistor or fixed resistor?

Is this a past paper?

Please could I have help on this question: explain how the reading on the voltmeter changes when the temperature of the room decreases.

I thought that as temperature decreases, the resistance of the thermistor increases so the voltage across it decreases therefore the voltage in the voltmeter will increase because the total voltage is constant in the circuit?
Yet the markscheme says something different. Thanks!!

Across the fixed resistor but isn’t the total voltage across the circuit the same so if the voltage across the thermistor decreases the voltage across the resistor should increase..?

When 2 resistors are in series with a cell, the resistor with larger resistance will have larger voltage across it. You can verify it using potential divider formula.



When the resistance of thermistor increases, the “total current” decreases. The voltage across the fixed resistor should decrease (V=IR).