Physics 9702 · AS & A Level · Potential difference and power

Potential difference and power — practice question

Two lamps are joined in series to a $250\,\text{V}$ power supply. One lamp has a rating of $240\,\text{V},\,60\,\text{W}$ and the other has a rating of $10\,\text{V},\,2.5\,\text{W}$. Which statement gives the best description of the result?

  • ABoth lamps light at less than their normal brightness.
  • BBoth lamps light at their normal brightness.
  • COnly the $240\,\text{V}$ lamp lights.
  • DThe $10\,\text{V}$ lamp blows.

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