# How does “ The Fruit Battery” work? [closed]

In the " Fruit Battery Project" where you are using copper and zinc wires connected to a fruit to generate power and transfer it over to a LED light. What happens once you connect the two wires to the fruit? Are electrical currents just automatically rushing through the wires? After that what happens once you connect the wires to a LED light? Are the currents flowing through the wires? Which wires holds what acids?

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This question appears to be off-topic because it is not about electronic design. It belongs in chemistry.stackexchange.com –  Kaz Nov 17 at 17:19
@Kaz or physics SE. Or here, because while it's such a bare bones elementary question, it is still about electronic design, in the same way as choosing a resistor for an led, how a spst switch works. In the scope the theory and simulation of electromagnetic forces. This is on electrical battery theory. –  Passerby Nov 18 at 2:04
^electrical is not electronic. Residential wiring is electrical; yet doesn't belong here. –  Kaz Nov 18 at 3:20
@Kaz yet we still handle questions like hooking up a relay to a residential outlet wiring, or how to toggle a light bulb, right? The lines blur, and this question, like many grey area questions, is on the Right side of the scope. –  Passerby Nov 18 at 23:32

## closed as off-topic by Kaz, Gustavo Litovsky, Daniel Grillo, Matt Young, PeterJNov 17 at 21:53

• This question does not appear to be about electronics design within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

The basic idea is that the lemon is acidic, meaning there is a higher concentration of hydrogen ions (H+) in solution than hydroxide ions (OH-). When the Zinc is placed into the acidic solution it will tend to oxidize/dissolve into the solution, releasing electrons which pair up with the hydrogen ions to form hydrogen gas. If you don't hook up a wire you're left with a standard galvanic corrosion process because the electrons will simply flow through the solution. However, the acidic/ionic solution is not very conductive compared to a copper wire hooked up and connected to a copper plate, also placed in the solution. The electrons will flow through the wire towards the copper plate, giving it a slight negative charge, which in turn attracts the positively charged hydrogen ions. I seem to remember this increases the reaction speed, but I'm not positive about this (pun intended). The most noticeable effect is that the hydrogen bubbles will be produced around the copper rather than around the zinc, which tends to be saturated with positively charged zinc ions.