3.1.16

Comparing Bulbs

Test yourself

Comparing Bulbs

Old filament bulbs had a power rating of 60W. An eco-friendly energy saving light bulb has a power rating of 15W. If both bulbs were turned on for one minute, how much energy would be transferred?

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Converting minutes to seconds

  • Time needs to be calculated in seconds, not minutes. So one minute needs to be converted to 60 seconds.
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Filament bulb calculation

  • Energy transferred = power (W) × time (s).
  • Energy transferred = 60 x 60 = 3600J.
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Energy saving bulb calculation

  • Energy transferred = power (W) × time (s).
  • Energy transferred = 15 x 60 = 900J.

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