tag:blogger.com,1999:blog-2520463471230563847.post662650533543484838..comments2024-03-09T00:18:44.209-08:00Comments on Renewable Energy for the Poor Man: Temperature Coefficient for Electrical ResistivityUnknownnoreply@blogger.comBlogger2125tag:blogger.com,1999:blog-2520463471230563847.post-15356778116482992732015-09-07T10:51:10.058-07:002015-09-07T10:51:10.058-07:00I retract my misinterpretation of your choice of g...I retract my misinterpretation of your choice of graphs. Too many distractions. I need a shed or office. But real shunts are still better for tight tolerance measurements over wide temperatures. Feel free to dump both comments :)Anonymoushttps://www.blogger.com/profile/07784987129123634441noreply@blogger.comtag:blogger.com,1999:blog-2520463471230563847.post-62477255314891329362015-09-07T10:41:35.674-07:002015-09-07T10:41:35.674-07:00Good blog by the way. A detail that will help if ...Good blog by the way. A detail that will help if you have not already caught it: The above chart is thermal resistivity, not thermal coefficient of electrical resistivity. Aluminum resistance is 2.82 x10 (-8) ohm/meter (don't care at the moment) and the thermal coefficient of resistivity is 0.0039 /deg. K. The simple math is 0.0039 x delta T x 2.82. But the easy thing is to consider the 0.0039 as a variation on percent change. So we look at the coefficient of resistivity of the neat alloy Manganin - 0.000002 or about 2000 times better than aluminum or many other metals. 18-8 Stainless steel has a Tcoef of 0.00094, 4 x better than many metals but not great if the temperature varies too much. Decent shunts are available cheap on ebay. <br />Neat stuff you do. Much appreciated.Anonymoushttps://www.blogger.com/profile/07784987129123634441noreply@blogger.com