If a meal in China uses 6MJ (1 MJ = 1,000,000) to cook how many meals could have been cooked with the energy wasted from the light bulb?
Extra tags:
- cooking food with a light bulb,number of joules required to cook a meal,100 watt light bulb left on for 1 month how much energy in joules was used,cook with a light bulb,wasted energy light bulb left on
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biire2u - said
March 6 2011 @ 13:13
1 Watt = 1 Joule/ 1 second
100 watt = 100 Joule / 1 second
30 days x 24 hour x 60 min x 60 second = 2,592,000 seconds in a month
100 J * 2,592,000 second = 259.2 MJ for 30 day month
259.2 MJ / 6 MJ = 43 meals could of been cooked
? - said
March 6 2011 @ 13:13
1 mo. = 30(24)(3600) = 2,592,000 s
1 W = 1 J/s
100 W = 100 J/s
(100 J/s)(2592000 s) = 259,200,000 J = 259.2 MJ
259.2 / 6 = 43.2 meals
Argent - said
March 6 2011 @ 13:13
It depends on whether you consider the total energy as having been wasted, or only the approximately 90% that is wasted as heat. I’ll use the 100% level.
100 W × 1 (J/s)/W × 86 400 s/day × 30 days = 259.2 MJ.
(259.2 MJ) / (6 MJ/meal) = 43.2 meals.
(If you want the 90% version, it’s 233.3 MJ and 38.9 meals.)
Let'slearntothink - said
March 6 2011 @ 13:13
The energy wasted = 100*3600*24*30 J = 259200000 J or 2.6*10^8 J
Meals that can be cooked in this energy = 2.6*10^8 / (6*10^6)
= 43 meals