O-LevelPhysicsElectricity5054/12 · Oct/Nov 2025 · Q331 Mark

A cardboard tube has two wires, P and Q, connected to its ends. Inside the tube, wire P and wire Q are connected to two resistors. The potential difference (p.d.) between wire P and wire Q is 9.0 V and the current in the wires is 0.75 A. [Figure 33.1] Which combination of resistors is inside the tube?

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A0.75 Ω resistor and a 6.0 Ω resistor in parallel

B0.75 Ω resistor and a 6.0 Ω resistor in series

C20 Ω resistor and a 30 Ω resistor in parallel

D20 Ω resistor and a 30 Ω resistor in series

✓ Correct answer

C: 20 Ω resistor and a 30 Ω resistor in parallel

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2025 Paper 1 Variant 2, question 33.

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