R ranjitjat New member Sep 12, 2002 #1 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???????????
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???????????
R ranjitjat New member Sep 13, 2002 #3 Please try again and answer in kgs This is matric tonne. good try
