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Help! Electricity igcse physics qs make no sense

could someone tell me why the voltage change is different in these 2 qs?
(edited 1 year ago)
Original post by j3ssica jon3s
could someone tell me why the voltage change is different in these 2 qs?


You did not show us the whole question. Where is the voltmeter located?
Is the voltmeter measuring the p.d. across the thermistor or other electrical component?
Original post by Eimmanuel

You did not show us the whole question. Where is the voltmeter located?
Is the voltmeter measuring the p.d. across the thermistor or other electrical component?

https://cdn.savemyexams.co.uk/uploads/2022/12/4ph1-1p-que-jan-2022.pdf its part of question 7

TSR_thermistor_01.jpg
In this circuit, the voltmeter is across the fixed resistor of a certain resistance value.
As the temperature decreases, the resistance of the thermistor increases, so the p.d. or voltage across the thermistor increases. But the p.d. or voltage across the 140 Ω-resistor will decrease, so the voltmeter’s reading decrease.
This is not very different from the circuit shown below. We are measuring the voltage across different electrical components.

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