An engineer designs a potential divider circuit for a temperature-monitoring system. The system needs to detect when the surroundings become too cold, turning on a heater.
Which component does the engineer need for the potential divider, in addition to a variable resistor, to sense the temperature change?
light-dependent resistor
relay
thermistor
diode
67 exam-style questions on CIE IGCSE Physics 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.