I have a question that I would like to ask, its from the 'loads of unit 4 questions' document on scribd
"The average wind speed in the UK is 5.8 m s–1, which results in an actual average power output of 100W. Discuss whether it would be better for the environment to replace some filament light bulbs with low energy bulbs than to use this turbine. Assume each filament light bulb is rated at 100W and each low energy bulb is rated at 11 W."
This is what the mark scheme says:
"Recognises that 100 W is produced over 24 hours (1) Estimates if this would fulfil lighting needs for a day (1) Estimates energy used by low energy bulbs in day (1) Conclusion (2) The answer must be clear and be organised in a logical sequence Example:The 100 W is an average over the whole day. Most households would use light bulbs for 6 hours a day in no more than 4 rooms, so this would mean no other energy was needed for lighting.4 low energy bulbs would be 44 W for 6 each hours so would require energy from the National grid.[Accept an argument based on more light bulbs/longer hours that leads to the opposite conclusion]"
I have never come across a question as involved as this - should I be worried?
Also, how is power over 24 hours? If Watts is in joules per second, and both the bulb and turbine use/generate 100 joules per second, surely they would cancel each other out?
Any help would be much appreciated mates
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