Lemon battery without copper and zinc metals

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Discussion Overview

The discussion revolves around the feasibility of lighting an LED using a lemon as a power source without employing traditional dissimilar metals, specifically copper and zinc. Participants explore the underlying principles of electrochemistry, the validity of a video demonstration, and the potential for alternative methods or materials.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions the validity of the video demonstration, noting that typically dissimilar metals are required for a battery to function.
  • Another participant humorously suggests that a lime might be necessary instead of a lemon.
  • A later post dismisses the video as a poor fake, implying that the demonstration is not credible.
  • One participant proposes the idea of plating one leg of the LED with zinc to create a deceptive appearance that could pass for an untreated LED in a video.
  • Another participant speculates on the possibility of using a magnesium/copper plated LED to achieve a voltage sufficient to light the LED, while discussing the expected voltage drop under load due to internal resistance.
  • Some participants suggest that the video could be misleading, proposing the presence of concealed wires or a hidden battery within the lemon.
  • One participant claims to identify signs of manipulation in the video, suggesting it is a digital fabrication.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the validity of the video demonstration. There are multiple competing views regarding the feasibility of lighting an LED with a lemon without traditional metals, and the discussion remains unresolved.

Contextual Notes

Participants express uncertainty about the specific requirements for creating a functional battery and the potential for alternative configurations. There are also references to the limitations of the video evidence presented.

Who May Find This Useful

This discussion may be of interest to those exploring electrochemistry, DIY electronics, or the credibility of online demonstrations related to science experiments.

fog37
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Hello,

I have seen a video online that shows how a LED can be lit using a single lemon without using a copper and a zinc nail. They simply stick the LED into the lemon.

What does that work? I know the lemon contains the electrolyte but don't we always need to dissimilar metals for the battery to work?
thanks!
 
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I think you need a lime for it to work.:rolleyes:
 
yeah, true. But why?
 
fog37 said:
yeah, true. But why?

It was a joke, the video is a poor fake.
 
If you wanted to fake it, could you plate one leg with zinc? It would look silver on a video and maybe pass for an "untreated" LED. The anodic index of silver solder is the same as copper according to the table here:
http://www.engineersedge.com/galvanic_capatability.htm
 
Let say you had a single cell made with a magnesium/copper plated tiny surface reaction area legs LED that might give 1.6 volts (the penny/nail open voltage is about 0.9) open circuit and drop to half that voltage value with a few micro-amp load because of high internal resistance. Would that work to light an LED?
1883Fig10.gif
 
Last edited:
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fog37 said:
I have seen a video online that shows how a LED can be lit using a single lemon without using a copper and a zinc nail. They simply stick the LED into the lemon.
Possibly there could be concealed wires or a battery buried inside the fruit?
 
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NascentOxygen said:
Possibly there could be concealed wires or a battery buried inside the fruit?

It is definitely a shoop. I can tell from the pixels. Third one from the left has shifty eyes.

BoB
 

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