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A-LevelPhysicsD.C. circuits9702/12 · May/June 2012 · Q341 Mark

A power cable X has resistance R and carries current I. A second cable Y has resistance 2R and carries current I/2. What is the ratio power dissipated in Y / power dissipated in X?

A1/4

B1/2

C2

D4

✓ Correct answer

B: 1/2

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About this question

Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2012 Paper 1 Variant 2, question 34.

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