An engineer is designing a timer circuit to keep a security light illuminated for a short period after a switch is released. Which pair of electronic components is essential for determining the duration of this time delay?
A thermistor and a light-dependent resistor
A resistor and a capacitor
A diode and an inductor
A transformer and a 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.