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After seeing the [http://wristifyme.com/ latest] in hipsterly-wanky-named products, and suffering from cold hands all the time, i thought - why not build my own. this is an attempt = Research = from [http://syneurgy.com/images/Downloads/Reference-9.pdf] In other words, on average the skin absorbs about 80 mW/cm2 to reach 41oC. In addition, skin temperature increases by 0.8oC for each 10 mW/cm2 of absorbed power. = Materials = http://www.conrad.nl/ce/nl/product/429066/Weerstandsdraad-63-m-5-m http://www.conrad.nl/ce/nl/product/429023/Weerstandsdraad-10-m5-m = Heating Element = P = VI<br> V = IR == 65ohm/m == Voltage: 5V<br> Resistance: 65ohm<br> Current: ?<br> Length = 0.5m<br> Current = 5/32.5 = 0.156A<br> Power = 5 * 0.156 = 0.78W<br> == 10ohm/m == Voltage: 5V<br> Resistance: 10ohm<br> Current: ?<br> Length = 1.5m<br> Current = 5/15 = 0.333A<br> Power = 5 * 0.333 = 1.665W<br> Length = 2m<br> Current = 5/20 = 0.25A<br> Power = 5 * 0.25 = 1.255W<br>
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