Difference between revisions of "Usb human heater"
| Line 8: | Line 8: | ||
this is an attempt | this is an attempt | ||
| − | + | = Research = | |
from [http://syneurgy.com/images/Downloads/Reference-9.pdf] | from [http://syneurgy.com/images/Downloads/Reference-9.pdf] | ||
| Line 16: | Line 16: | ||
power. | power. | ||
| − | Materials | + | = Materials = |
http://www.conrad.nl/ce/nl/product/429066/Weerstandsdraad-63-m-5-m | 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 = 0.78 | ||
| + | |||
| + | == 10ohm/m == | ||
| + | |||
| + | Voltage: 5V | ||
| + | Resistance: 10ohm | ||
| + | Current: ? | ||
| + | |||
| + | Length = 1.5m | ||
| + | Current = 5/15 = 0.333A | ||
| + | Power = 5 * 0.333 = 1.665 | ||
Revision as of 21:14, 10 January 2014
| Projects | |
|---|---|
| Participants | Amx109 |
| Skills | |
| Status | Planning |
| 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 = 0.78
10ohm/m
Voltage: 5V Resistance: 10ohm Current: ?
Length = 1.5m Current = 5/15 = 0.333A Power = 5 * 0.333 = 1.665
