Home › CBSE Class 11 (Science) › Physics › Work and Energy › A 100 watt bulb left on for 10 hours uses:
A 100 watt bulb left on for 10 hours uses:
A1 kilowatt hour
B2 kilowatt hours
C5 kilowatt hours
D3 kilowatt hours
Answer & Solution
Correct answer: A. 1 kilowatt hour
1. Multiply the power by the time.
2. 100 watts times 10 hours is 1000 watt hours.
3. That is 1 kilowatt hour of energy.
_Source: syllabus Physics Part I, Ch 6 'Work, Energy and Power'_
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