An engineer is calibrating a negative temperature coefficient (NTC) thermistor designed for monitoring sub-zero arctic environments. They initially use a standard water bath to investigate how its electrical resistance changes over a temperature range from 5 ∘C5\,^{\circ}\text{C}5∘C to 60 ∘C60\,^{\circ}\text{C}60∘C.
State one modification the engineer must make to the liquid bath setup to investigate the resistance of the thermistor at temperatures down to −25 ∘C-25\,^{\circ}\text{C}−25∘C.
59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.