Rswarbrick

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Lemon battery.svg

Hi. Would you be willing to create a more positive version of the lemon battery image, which is presently the lead of the lemon battery article? Technically speaking, your image is incorrect: a lemon battery can illuminate a tungsten filament light-bulb if everything is done correctly, but no one would bother with this anymore. To get an LED to light, one normally puts 3 lemon batteries in series. For a single lemon battery, all you can usually do is measure its voltage. So a positive image would just show a voltmeter reading 1.00 Volts. Are you interested in creating this? Easchiff (talk) 00:36, 5 October 2012 (UTC)

Hi, Actually I made the version that's up at the moment following an existing (low quality) gif. I could make a version with a voltage measurement if you'd like (or you could?). That said, a voltage of 1V is not much use when there's a huge internal resistance, which I believe is the case for fruit cells. Maybe it'd be nicer to have an image of three lemons powering an LED? It seems more interesting than "ooh look, a number comes out". That's just my opinion anyway. Rswarbrick (talk) 10:10, 5 October 2012 (UTC)

I liked the style of your image, and I like your ideas about new possibilities. Your comment about internal resistance is undoubtedly correct. Students often use single galvanized nails and single copper wires, which don't have much area inside the lemon, and hence have lower short-circuit currents from the battery. Your image shows larger, flat electrodes, which is what I actually use; I teach at a university. Anyway, an image showing 3 lemons operating an LED would be good, but it is some work to design and execute it. I've started to revise that article; it's heavily used, probably by students looking up science projects and homework. If you decide to go for it, the new image could be part of a new version that's a little more helpful for the students. cheers, Easchiff (talk) 10:22, 6 October 2012 (UTC)

How about something like this: Image:Lemon_Battery_With_LED.svg? (In particular, can you check I've got the leads the right way round? I always get the anodes and cathodes mixed up, and it matters with an LED!) Rswarbrick (talk) 11:47, 6 October 2012 (UTC)

That's a great diagram! I think you can expect that it will be swiped thousands of times per year for science fair projects, etc.. I'll carefully check the polarity and write again; I don't recall these things off the top of my head. Thanks for your work - Easchiff (talk) 15:34, 6 October 2012 (UTC)

OK, I've checked, and I think you got the polarities right. thanks again, Easchiff (talk) 16:28, 6 October 2012 (UTC)

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