The citric acid in the lemon provided the electrolyte component. A galvanized nail provided the zinc anode (negative terminal), and a copper penny provided the cathode (positive terminal).
Our single lemon was able to produce 0.9 volts, as measured by our multi-meter.
* It's important to roll the lemon on a table and squeeze it a bit to soften it. This allows the citric acid in the lemon juice to flow more freely.
* To illuminate the LED, we added 3 more lemons in series, and YES! It did work!
* We experimented with various configurations (parallel and series) to see how the voltage and current is affected.
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