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Posts Tagged ‘rhubarb’

Dismantling of the rhubarb electric generator


Here are the pictures of the dismantling of the rhubarb electric generator. 

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Above, a picture of the elements that composed the electric generator (zinc + copper + electrical wire).

Démontage du générateur électrique à rhubarbe, photo 2

The first step consists in removing the electrical wires (picture above).

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You then put aside the zinc elements (picture above).

And set aside the copper elements (picture below) :

Démontage du générateur électrique à rhubarbe, photo 4

The last step consists in taking a sponge, to water the elements and rub well (put the element un the middle of the sponge, close then pull towards you).

Démontage du générateur électrique à rhubarbe, photo 5

The zinc elements are now cleaned (picture above). There still stays an area a bit black. If someone know how to completely clean the zinc elements, plus leave a comment below.

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Above, the copper elements (much easier to clean).

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Guillaume, experiment coordinator Rhubarb electric generator

[Experiment 1] 12 Volt rhubarb generator


During the summer 2012 Francophone Meetings, I was able to build a rhubarb generator.

The objective of the experiment was to reach 12 V with 2 leafstalks of rhubarb.

With the first leafstlk, I amost got to 6 V (picture above!)

So I continued to cable the rhubarb pieces in series to increase the voltage.

And there! I got past 6 V !

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On this 3rd picture, we can see that the 11 V have been exceeded !

This is the picture zoomed on the multimeter. It shows  11,30 V !

A week and a day later, the rhubarb has aged well. It has become black.

Here we can see a mould formation.

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Here we can see well the colour transformation from dark pink to black.

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Tension has well decreased. It is now at 2,08 V.

 On the intensity side, we have  145 µA.

As for the electodes, we can immediately notice a strong oxydation to anode (the rode is zinc).

To the question « Is it  possible to create a 12 V rhubarb generator ?« , the answer is yes (and even more).

On the one hand, it doesn’t last a week (contrary to the potato generator, which on it’s side, has the disadvantage to take up more space than the rhubarb generator that has a good ratio tension / space).

On the other hand, rhubarb doesn’t cost much and can almost provide 6 V per leafstalk…


Guillaume, coordinator « experience 12 Volt rhubarb generator »