Exam-style question
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If a typical light bulb uses about 60 watts of power, how much energy does it use in 5 hours?.
- A.300 J
- B.1800 J
- C.108000 J
- D.216000 J
Model answer
What a good answer should say
- 108000 J
Explanation
Why this works
Using the formula: energy = power × time. Substituting gives: energy = 60 W × 5 h × 3600 s/h = 108000 J.
This estimate checks out as it aligns with typical energy consumption for household appliances.
Common mistake
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