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anonymous
 4 years ago
How many Joules of energy are required to run a 100W light bulb for one day?
Burning coal yields about 30 x 10^6 J of energy per kilogram of coal burned. Assuming that the coal power plant is 30% efficient, how much coal has to be burned to light that light bulb for one day?
anonymous
 4 years ago
How many Joules of energy are required to run a 100W light bulb for one day? Burning coal yields about 30 x 10^6 J of energy per kilogram of coal burned. Assuming that the coal power plant is 30% efficient, how much coal has to be burned to light that light bulb for one day?

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JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.1Ok. By definition power = change in work/energy over time. P = W/t Hence, how much energy does the bulb consume in one day?

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.1Work, W = (Power)*(Time) or Energy, E = (Power)*(Time) hence how much energy does the bulb consume?

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.1Watts = Joules/second. The light bulb is rated as a 100 Watt bulb.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Hi James, sorry I went offline, but thanks so much for your great help! Much appreciated!
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