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Old 04-18-2016, 12:19 PM
engineer_comp_geek engineer_comp_geek is offline
Robot Mod in Beta Testing
Join Date: Mar 2001
Location: Pennsylvania
Posts: 20,585
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.