Sunday, April 13, 2008

Something I've Been Working On...


Accounting of energy in USD/Joule...

3 comments:

Tygogal said...

See Please Here

Lauren said...

iiiiiiinteresting.

Kevin said...

I suggest you check your math.

For electricity, your answer is off by an order of magnitude. For $0.10/kwh, I get 2.778*10^-8 USD/J.

Gasoline, at 45 MJ/kg, 750 kg/m^3, and 3.59/gal (your estimate), I get 2.81*10^-5 USD/J. At 3.89/gal, I get 3.04*10^-5 USD/J. With that last price, throwing in the efficiency of automobile engines as 30%, I get 1.015*10^-4 USD/J.

For a Snickers bar at 280 kcal and your price of $0.85, I come up with 7.26*10^-7 USD/J.

I should work out something like this myself, including various types of foods and whatnot, and post it on a blog of my own.