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Physics (AS & A Level) · Oct / Nov 2022 · Paper 12 · Question 18

9702Energy conservation

A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given out by the lamp as light is 7.0 × 10³ J. How much energy is converted to other forms by the lamp?

  1. A120 J
  2. B200 J
  3. C3400 J
  4. D7200 J

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Correct answer: B. 200 J

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