Clock with a lemon

Clockmaker Tony Eichil was able to connect clock with a lemon. In his spare time Tony often spent a cup of tea. Once, taking a lemon from a vase, he introduced two electrodes: zinc and copper. The ends of the electrodes Eichil connected to a miniature motor clock. The result of a seemingly meaningless experiment struck those around: the clock with lemon worked non-stop for five months! The inventive watchmaker decided then to connect the television set to the rhubarb for this occasion, the roots and stems of which contain a lot of acid. What happened, unfortunately, is unknown.

Clockmaker Tony Eichil managed to connect the watch with a lemon

It is known that fruits contain weak acid solutions. If you take instead of a lemon, for example, an apple and stick a copper wire into it, and at a distance from it a piece of galvanized iron, you get galvanic element. Measure the voltage on the battery with a voltmeter, it will show about 1 V. You can see this without a voltmeter either: touch the tongue at once to the copper and zinc - the language will be protected! You can make a battery more, including several elements in series.

Interestingly, the cultures of some organisms are also capable of producing electric current. If dropped into a liquid culture of Escherichia coli or conventional yeast platinum electrode, and another - in the same nutrient medium, but without microbes, then a potential difference occurs.