CAIE IGCSE Physics: Diodes & LEDs in Circuits Question Bank
Practise interpreting diode and LED circuits, including one-way current, reverse bias and rectified a.c. output graphs.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- explain why an LED lights only when the diode is forward biased
- choose the current or p.d.-time graph produced by a diode with an a.c. supply
- interpret four-diode circuits to decide the direction of current through a resistor
4.3.1.2—Circuit diagrams containing diodes and question 1
Fig. 6.2 shows two light-emitting diodes (LEDs) connected in parallel in a circuit. R is a red LED and G is a green LED.
The voltmeter across the LEDs shows a potential difference (p.d.) of 2.0 V.
Fig. 6.2
The connections to the power supply are reversed. State the reading on the ammeter.
current =
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