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<p>[QUOTE=&quot;-jeffB, post: 2978105, member: 27832&quot;]The limiting factor would probably be the resistance of the solution, and that&#039;s determined by its concentration (how much citric acid you put in) and the size and composition of the electrodes (coin and whatever you use on the other side).</p><p><br /></p><p>If a charger says &quot;5 volts, 2 amps&quot;, that means it&#039;ll provide 5 volts at <i>up to</i> 2 amps. Most likely, you&#039;ll draw nowhere near 2 amps, though, unless you touch the electrodes together (short-circuit). If you try to draw more than 2 amps, either the output voltage will drop, the charger will cut itself off, or it&#039;ll overheat and fail.</p><p><br /></p><p>A higher-voltage charger will push more current through the same resistance. In other words, if a 5-volt charger pushes 0.5 amp through your setup, a 12-volt charger would push 1.2 amp (as long as everything is arranged exactly the same).</p><p><br /></p><p>I really, really should experiment with this myself -- I&#039;ve got a couple of power supplies that let me set the current, and then provide whatever voltage is needed to drive exactly that much current.[/QUOTE]</p><p><br /></p>

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