Essential PC hardware
07 January 2004, 11:15 AM
#1
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07 January 2004, 12:32 PM
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Also this:
http://www.thinkgeek.com/stuff/looflirpa/igrill.shtml
Not sure if it would be acceptable to use in the office or not though...
http://www.thinkgeek.com/stuff/looflirpa/igrill.shtml
Not sure if it would be acceptable to use in the office or not though...
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07 January 2004, 03:54 PM
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well, drawing 500mA at 12V gives us 6W to play with. I think that's the limit of current draw through the USB spec.
A small cup of water to be heated is what, 250ml, weighing 250g?
Specific heat capacity of water is approximately 4200J/kg K.
You need to have water at around 80 degrees C to get the flavour out of tea. Assuming room temp is 20 degrees, you need to raise it by 60 degrees, so you need 60 * 250 * 4.2 = 63000J of energy.
So, just under 3 hours later you'd have water hot enough to make a small cup of tea, assuming your insulation was perfect and you suffered no loss of heat through evaporation etc. Best make it 3 and a half hours then, just to be sure
Cheers,
Nick.
A small cup of water to be heated is what, 250ml, weighing 250g?
Specific heat capacity of water is approximately 4200J/kg K.
You need to have water at around 80 degrees C to get the flavour out of tea. Assuming room temp is 20 degrees, you need to raise it by 60 degrees, so you need 60 * 250 * 4.2 = 63000J of energy.
So, just under 3 hours later you'd have water hot enough to make a small cup of tea, assuming your insulation was perfect and you suffered no loss of heat through evaporation etc. Best make it 3 and a half hours then, just to be sure
Cheers,
Nick.
07 January 2004, 04:37 PM
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Thats why machines now come with at least 8 USB ports
07 January 2004, 07:54 PM
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