scott wrote:
>> I have no idea what internal resistance is.
> 
> A pretty accurate model of a battery is a perfect voltage source in 
> series with an "internal" resistor.  This then nicely explains how the 
> more current you try to draw the lower the apparent voltage will be at 
> the terminals of the battery.

As far as I'm aware, resistors affect only current, not potential. But 
hey, I'm sure you know more about this than me...

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