An electrical circuit is used to monitor the temperature inside an automated greenhouse. The circuit consists of a 6.0 V6.0\ \text{V}6.0 V battery, a fixed resistor of resistance 150 Ω150\ \Omega150 Ω, and a thermistor connected in series. A voltmeter is connected in parallel across the thermistor.
At a particular temperature, the potential difference across the thermistor is 2.4 V2.4\ \text{V}2.4 V. Calculate the potential difference across the 150 Ω150\ \Omega150 Ω resistor.
At a different temperature, the resistance of the thermistor decreases until it is equal to 150 Ω150\ \Omega150 Ω. Find the potential difference across the thermistor at this temperature and give a reason for your answer.