Difference between revisions of "Usb human heater"
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Current = 5/15 = 0.333A<br> | Current = 5/15 = 0.333A<br> | ||
Power = 5 * 0.333 = 1.665W<br> | Power = 5 * 0.333 = 1.665W<br> | ||
| + | |||
| + | Length = 2m<br> | ||
| + | Current = 5/20 = 0.25A<br> | ||
| + | Power = 5 * 0.25 = 1.255W<br> | ||
Latest revision as of 16:23, 17 August 2016
| Projects | |
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| Participants | Amx109 |
| Skills | |
| Status | Dead |
| Niche | Electronics |
| Purpose | Fun |
After seeing the 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 [1]
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
V = IR
65ohm/m
Voltage: 5V
Resistance: 65ohm
Current: ?
Length = 0.5m
Current = 5/32.5 = 0.156A
Power = 5 * 0.156 = 0.78W
10ohm/m
Voltage: 5V
Resistance: 10ohm
Current: ?
Length = 1.5m
Current = 5/15 = 0.333A
Power = 5 * 0.333 = 1.665W
Length = 2m
Current = 5/20 = 0.25A
Power = 5 * 0.25 = 1.255W
