I've been doing a little research on the earth batteries of the 1800's. Very interesting. I managed to light a single LED light with a series of 8 cells consisting of sand, plastic cups, a graphite rod, and some alloy metal (I'm not sure of the exact composition). I set it up similar to an old wet cell; graphite to the alloy metal immersed in the sand which was in a plastic cup, making a total of 8 cells. The total reading on my multimeter was areound 6-8 volts, it didn't exactly remain constant. The LED did not shine brightly either, nonetheless light was still being emitted. When I tested the voltage entereing the LED though it was only around 3-4 volts. The current was extremely low, only around .1 mA. I can't really see any practical use for something like this, but I still find it fascinating that it actually works.

Neat, did you have any query/question or are you just telling us about it?

You know that if your car's battery is out-of-power, you can recharge it by burying it

in a hole at the ground after wetting it with some water,

 

wondrous, isn't it ...

 

although the 4-5 volt\ 1 mA is too low for any use we know .. but the nature make many uses of that,

some are biological .. and others we know not ...

Edited March 8, 201114 yr by khaled