A-LevelPhysicsD.C. circuits9702/12 · May/June 2014 · Q321 Mark
The diagram shows an electric pump for a garden fountain connected by an 18 m cable to a 230 V mains electrical supply. [Figure 32.1] The performance of the pump is acceptable if the potential difference (p.d.) across it is at least 218 V. The current through it is then 0.83 A. What is the maximum resistance per metre of each of the two wires in the cable if the pump is to perform acceptably?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A0.40 Ω m⁻¹
B0.80 Ω m⁻¹
C1.3 Ω m⁻¹
D1.4 Ω m⁻¹
✓ Correct answer
A: 0.40 Ω m⁻¹
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