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ranjitjat
September 12th, 2002, 09:56 PM
SUppose the average efficiency of a coal-fired power plant is 40 percent and that one tonne of coal contains 7000 kilowatt hours of energy.How much coal would it take to light one 100 watt lightbulb for a full year???????????

srajdeep
September 13th, 2002, 06:59 PM
312.86 tonne?

ranjitjat
September 13th, 2002, 10:34 PM
Please try again and answer in kgs
This is matric tonne.
good try