Tuesday, July 05, 2005


Eco Car More Efficient than Light Bulb

I'm sure it really is, but that's not what the story says- the story just says it uses less energy. Efficiency is the ratio of energy consumed to useful energy output. A locomotive that uses gallons of diesel per mile is far more efficient than a car that uses one gallon for 30 miles. Because it converts more of the energy in the fuel to motion. A lightbulb isn't particularly efficient, it loses a lot of energy to heat.

I'm also shocked to learn that there are only ~12 watts in a gallon of gasoline. That seemed low to me... It is. So they're completely wrong.


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