CAPE Physics Unit 2 · May/June 2023 · Paper 2 · Question 2(b)

An intern designed the simple comparator circuit in Figure 4 to trigger an alarm if the aircraft wing temperature drops below a threshold value, to prevent icing.

Explain how the circuit in Figure 4 will function to trigger the alarm if the temperature drops below the threshold value.

This question uses a figure or table from the paper — you'll see it when you practise.