An engineer designs a potential divider circuit for a greenhouse ventilation system so that when the temperature becomes too high, a cooling fan turns on.
Which sensor component does the engineer need to use in addition to a resistor to detect the change in temperature?
light-dependent resistor
thermistor
relay
variable resistor
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.