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Old 04-18-2016, 12:28 PM
blood63 blood63 is offline
Join Date: Aug 2009
Posts: 398
Originally Posted by engineer_comp_geek View Post
Sure. You'd need a lot of lemons.

The basic idea is there. The lemon battery is often demonstrated in basic science classes. All you need to make a battery is two dissimilar metals in an acidic electrolyte, so if you shove copper into one side of a lemon and zinc into the other, you've got a battery. It's a pretty weak battery, typically producing a bit less than a volt and current maybe around a milliamp or so. More surface area on your metal anode and cathode will give you more current.

Using steel wool to start a fire is also pretty well known. It is commonly done with 9 volt batteries. A 9 volt battery can put out a lot more current than a lemon battery though.

A table-top's worth of lemons tied in series-parallel strands should do the job easy enough.
Or, instead of buying 20 or so lemons, I could slice each lemon into sections. Another video states that the electrodes will corrode very quickly in the acid and that I only have a limited amount of time before the current drops. Is this true?