O-LevelPhysicsElectricityOct/Nov 2024Paper 3 Q210 Marks
In this experiment you will investigate how the resistance of a light-emitting diode (LED) changes with different currents. You are provided with: • a power source • a switch • a voltmeter with two leads that may be connected between different points in the circuit shown in Fig. 2.1 • a light-emitting diode (LED) • a 270Ω resistor, a 470 Ω resistor and a 560 Ω resistor • sufficient connecting leads to make the circuit shown in Fig. 2.1. The supervisor has set up the circuit shown in Fig. 2.1. The 270Ω resistor is connected in the circuit and the 470Ω resistor and the 560Ω resistor are placed by the side of the circuit. [Figure 2.1]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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