An engineer designs a circuit to control an indicator light after a predetermined time delay. Which pair of components is primarily responsible for determining the duration of the time delay in this type of timing circuit?
a diode and a thermistor
a resistor and a capacitor
a transformer and a light-dependent resistor
a transistor and a relay
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.