Ace A Level Physics 2026 – Power Up Your Physics Prowess!

Stirring the water during a temperature-resistance experiment with a thermistor is crucial for ensuring a uniform temperature distribution. When you measure the resistance of a thermistor, it is vital that it is exposed to a consistent temperature throughout the entire water sample. Without stirring, there could be variations in temperature due to localized heating or cooling, which might occur because of the thermistor itself or other external factors.

By stirring the water, you promote convection currents, which helps to distribute the temperature evenly throughout the liquid. This uniformity allows for accurate readings of the thermistor's resistance at a given temperature, leading to reliable data that reflects the true relationship between resistance and temperature.

The other factors mentioned, such as cooling the thermistor quickly or measuring the boiling point, do not directly relate to the purpose of stirring. Increasing resistance is also not a goal of this action; rather, it is about obtaining accurate resistance readings corresponding to a stable temperature.