# Lemon Charger Dilemma

#### CastleXman

Joined May 17, 2021
3
Hello All, Im wondering if Someone could help me with a science experiment I'm doing with my son. He's doing a new twist on the classic Lemon battery experiment. He's trying to see if we can figure out how many Lemons it would take to charge an iPad. Everything I can find says it would take 5.1 volts and 10 watts to charge. Heres my problem. We are finding that adding lemons to a circuit in series will boost the voltage by about .9 volts per lemon. giving us enough voltage after 6 lemons. but we only get .2mA of current no matter how many we add. In Parallel, I can add an extra .2 mA in current but the volts remain at .9v no matter how many lemons we add in parallel. My question is, Is there a scenario, or some kind of series/parallel way of wiring that would eventually allow us to achieve enough Voltage and Current to power the iPad. Thanks in advance for any help!!

#### Bernard

Joined Aug 7, 2008
5,788
At the bottom of this post is Similar Threads, read Lemon Battery Experiment.
You could use a stack of alternating Zn & Cu squares seperated by paper toweling soaked in lemon juice? Where to find Zn sheet metal??

#### Audioguru again

Joined Oct 21, 2019
3,199
10W/5.1V= 1.96A.
1.96A/0.2mA= 9800. Maybe you wrongly measured the shorted max current.
0.9V x 6= 5.4V which will drop when it is loaded.
Then you need 9800 x 6= 58,800 lemons or more if the voltage drops too much.

#### CastleXman

Joined May 17, 2021
3
10W/5.1V= 1.96A.
1.96A/0.2mA= 9800. Maybe you wrongly measured the shorted max current.
0.9V x 6= 5.4V which will drop when it is loaded.
Then you need 9800 x 6= 58,800 lemons or more if the voltage drops too much.
Thanks!! But would there be a specific way I would have to wire it? Because if our results remained consistent, even 9800 lemons in parallel wouldn’t have voltage above .9 volts. Are you thinking I would need 6 sets of 9800 lemons wired in parallel and then wire all of those together in series?

#### atferrari

Joined Jan 6, 2004
4,329
Be realistic: pieces of lemons is the key.

Someone showed on the Web, audio equipment in a car fed by a power supply consisting of a huge number of cells with squares portions of lemons properly connected to get voltage/current for it to work.

BTW, I recall seen in NOLA, a big LCD clock running on a single potato.
Had I to do something like this I would go the potato way; much easier to handle.

#### boostbuck

Joined Oct 5, 2017
42
"..... thinking I would need 6 sets of 9800 lemons wired in parallel and then wire all of those together in series?"
That's correct.

#### Audioguru again

Joined Oct 21, 2019
3,199
Yeah, the current was probably measured when the "battery" was shorted. Then 10 times more lemons are needed for a total of
a little more than half a million. It is a silly project.

#### MrChips

Joined Oct 2, 2009
23,536