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Re: Please would you justify...


Tin is a realatively poor conductor, being 26th on a scale of 44 conductors and is only 4 'steps' above lead. It's specific resistance is 78.2 ohms per foot compared to copper's 10.4 ohms. Nickel (uuuugghh) is 17th on the scale @ 41.7 ohms/ft.

Well it's easy to make things look really bad when you put it that way.

But let's be a bit realistic here. What's the resistance of a few microns of tin?

Let's say we have a contact area of just 1 square millimeter and the thickness of the tin is 10 microns.

All else being equal, the tin will add 0.00000115 ohms, or 1.15 micro-ohms of resistance.

If you've made a set of cables using 24 gauge copper wire, that's the equivalent of increasing the length of the wires by 0.0005 inch.

se






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  • Re: Please would you justify... - Steve Eddy 21:39:48 10/12/06 (0)


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