> That logic IS the internal resistance. You'd just need to put some mind
> to it (and maybe read a book for ages 15 and above), and you'd certainly
> figure it out.

LOL! Now I have the mental image of electronics textbooks having age 
certificates.

Stuff like "Certificate 18; Contains non-conventional current flow 
direction and nonlinear diode behaviour. May be shocking to certain 
readers." ;-)

Obligatory XKCD quote: http://www.xkcd.com/567/

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