A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2011 · Q171 Mark

In many old-style filament lamps, as much as 92 J of energy is emitted as thermal energy for every 8 J of energy emitted as light. What is the efficiency of the lamp, as the percentage of electrical energy converted to light energy?

A8%

B9%

C91%

D92%

✓ Correct answer

A: 8%

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2011 Paper 1 Variant 2, question 17.

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