A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2015 · Q371 Mark

The electromotive force of a power supply is 120 V. It delivers a current of 1.2 A to a resistor of resistance 80 Ω and a current of 0.40 A to another resistor, as shown. [Figure showing a power supply connected to a parallel combination of two resistors]

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A15 Ω

B20 Ω

C60 Ω

D75 Ω

✓ Correct answer

A: 15 Ω

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2015 Paper 1 Variant 2, question 37.

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