Talk:Aquadag
Add topicLatest comment: 10 years ago by Andy Dingley in topic "Ohms per square"?
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Some information on how Aquadag is made should be added.
Use on TV cases
[edit]Aquadag is also often seen coating the inside of the rear cover on CRT tvs. 82.31.207.100 (talk) 20:03, 26 December 2010 (UTC)
"Ohms per square"?
[edit]What is that supposed to mean? Ohms per square inch? Per square centimeter? Or what? -- 80.171.0.198 (talk) 21:55, 7 April 2016 (UTC)
- It means, surprisingly, "ohms per square". Unexpected, but quite neat when you work it out.
- This is the case for resistivity in thin sheets or varying size, but constant thickness (or constant resistance perpendicular to the plane). A resistance wire has resistance proportional to the length, but in a sheet the resistance remains the same with a scaling in its area.
- Think about combinations of resistors in series and in parallel. Two in series doubles it, two in parallel halves it. So four, in series-parallel, will remain the same. Do it again with a bit more care over the maths and you can prove that this holds for sheets having a resistance that is constant with geometry and so can be expressed as "ohms per square". A square of sheet (or Aquadag coating) will have a resistance that remains the same for a large square or a small square.
- See also sheet resistance and Teledeltos Andy Dingley (talk) 22:12, 7 April 2016 (UTC)