
Here’s an Instructable on building primitive batteries, interesting not so much for its (low-current, low-voltage) results but as a nice overview of a different way of making batteries. Also check out this Wikipedia entry on earth batteries, which I found via this Instructable.
2 thoughts on “Building a Baghdad battery”
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The first battery circuit provides a relatively higher voltage than the second and so it can therefore be used to power devices that need ‘higher voltages’ but low currents. http://www.whatisall.com/mysteries-unusual/what-is-baghdad-battery.html