A great story from Daniel Eichhorn explaining a ‘lemon battery’ experiment to his daughter. We love stories like these.
My goal was to demonstrate electricity to my daughter with something a little bit more understandable than the readings from a multimeter, since she cannot read the numbers yet. So, as suggested in the Wikipedia article I wanted to get an LED to shine. 0.9V wouldn’t be enough to make that happen, so we got a few more lemons and put them into series:
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