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$120 is expensive.It would take 16 years to make 2 cents on your investment. You don't believe me, here is my calculation: Regarding energy usage: 1 cup of wat
by starware 12y ago
$120 is expensive.It would take 16 years to make 2 cents on your investment. You don't believe me, here is my calculation:
Regarding energy usage:
1 cup of water is 28 grams
t0=25s
t1=100s
C=4.1810^3J/kg.s
Q=mc(t1-t0) for boiling Q=.0284.1810^375=8778J
8778J correspond to
0.00243833333 kilowatt hours
so if you pay .11$ per Kw hour
we are talking about 2 cents per cup!
If we are wasteful and 2 cups of water and drink 1 we have wasted 2 cents. How much time I have wait to make profit on my 120 investment.
120/0.02=6000
And if you drink 1 cup of tea a day. You have wait 6000/365=16 years.
You have to wait 16 years to make money on your investment.
- unwind 12y agoUh, no, a typical cup is way more than 28 grams of water. A standard metric cup is 250 ml, so you're off almost by a factor of 10 on that value, at least. I didn't check your calculations, perhaps that was just a typo though.