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Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 33

9702Potential difference and power

Two lamps are connected in series to a 250 V power supply. One lamp is rated 240 V, 60 W and the other is rated 10 V, 2.5 W. Which statement most accurately describes what happens?

  1. ABoth lamps light at less than their normal brightness.
  2. BBoth lamps light at their normal brightness.
  3. COnly the 240 V lamp lights.
  4. DThe 10 V lamp blows.

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Correct answer: B. Both lamps light at their normal brightness.

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