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<p>[QUOTE=&quot;-jeffB, post: 2790183, member: 27832&quot;]For one-centimeter contact widths, given the formula above, I get a resistance of around 7 microohms. Run 100 amps through the coin, and you&#039;d get a voltage drop of 700 microvolts, possible to measure with a meter like mine -- but not very accurately; copper&#039;s resistance would be higher by a factor of about 17/16, or about 740 microvolts. I couldn&#039;t take a single reading and get a go/no-go answer, but a comparison between a known-good ASE and a copper one would give a fairly reliable difference.</p><p><br /></p><p>At that current level and voltage drop, you&#039;d be dissipating 74 milliwatts across the coin itself. It would barely get warm to the touch. Your contacts, on the other hand, would heat up pretty quickly.</p><p><br /></p><p>But if you wiggle the contacts just a little bit, or if there&#039;s just a little bit of skin oil or dust on the rim, your contact area will fluctuate significantly. That will also create hot spots, <i>especially</i> if you&#039;re using a constant-current source (which maintains a constant current by adjusting the voltage). Sparks are likely; fireworks are possible. Running 100 amps through a metal plasma involves a <i>very great</i> deal of energy.</p><p><br /></p><p>A crummy method, but one with a lot of entertainment potential.[/QUOTE]</p><p><br /></p>

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