Lemon Battery: How to create electricity with fruits

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We are facing a real trend of folks converting to green energy. This can be achieved by using solar powered generators or wind turbines. Creating electricity from fruits will not give you enough juice to power your gadgets, but in some cases it can generate just enough to power a small LED. This is probably the simplest science project every kid has experimented or heard about at least once in his lifetime.  The most effective fruit to use in this project is the lemon.


How does the lemon battery works?

The lemon battery works like every battery in the world:  two different metals (anode and cathode) are suspended in an acidic solution, creating a flow of electrons inside the acid. This flow is exploited and converted into eletric power. The lemon contains acid, a substance that dissolve metals and create metal ions. Those ions move freely inside the acid lemon. In this scenario, the copper penny and the zinc nail acts like the anode and the cathode. The zinc dissolves slowly in the acid, collecting the positive ions from the lemon (hydrogen), and the zinc gathers the negative electrons.

One single lemon battery creates 0.7-1 volt of electricity and a current around 1mA. If you plan to power a small LED, you will need at least 3-4 lemons. Creating a setup of lemon batteries will not last for long, because the lemon power drains pretty quick. A lemon used in such experiments should never be eat, because it’s poisonous because of the dissolved copper salts.

via Wikipedia

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