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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

QUICK ANSWER…

B

DETAILS…

Data given:

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:

1. Option A is incorrect.
2. Option B is correct.
3. C is incorrect.
4. D is not the correct answer.

KEY-POINTS…

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 /