May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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37Series Parallel Circuit AnalysisHard1 mark
A battery of electromotive force (e.m.f.) 18.0 V and negligible internal resistance is connected to a network of three fixed resistors as shown.
circuit diagram: an 18.0 V battery in series with the ammeter reading 0.108 A, connected to resistor X, which is in parallel with a branch containing a 100 ohm resistor in series with a 400 ohm resistor
The current in the battery is 0.108 A. What is the resistance of resistor X?