An electric lamp marked 240V 60 Watts is left to operate for…
An electric lamp marked 240V 60 Watts is left to operate for an hour. How much energy is generated by the filament?
A. 3.86 × 10⁵J
B. 2.16 × 10⁵J
C. 1.80 × 10⁵J
D. 3.56 × 10⁵J
Power of the lamp = 60watts
Time of operation = 1 hour = 60 minutes = 60 × 60 seconds = 3600 seconds
But energy = power × time
Energy = 60 × 3600 = 216000 = 2.16 × 10⁵J
Now for the right answer to the above question:
- Option A is incorrect.
- Option B is correct.
- C is incorrect.
- D is not the correct answer.
You may please note these/this:
- Remember to convert the time from hour to seconds.
- The voltage marking does not really matter here, as it only indicates the maximum recommended voltage above which may destroy the lamp.
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/ culled from 2015 JAMB-UTME physics past question 39 /