voltage of cooked/ uncooked vegetables

Maurax1212 · Post by **Maurax1212** » Sun Feb 04, 2007 5:15 pm

why do cooked vegetables have a higher voltage than uncooked vegetavles?

Louise · Post by **Louise** » Sun Feb 04, 2007 6:02 pm

Maurax1212 wrote:why do cooked vegetables have a higher voltage than uncooked vegetavles?

I don't think cooked vegetables have a higher voltage than uncooked vegetables. I would guess most vegetables would have no voltage, cooked or uncooked. Cooked vegetables might have a lower resistance though.

Could you describe your experiment in more detail, and provide some example data so we can help?

Louise

Maurax1212 · Post by **Maurax1212** » Sun Feb 04, 2007 7:57 pm

I measured the voltage of potatoes, onions, lemons, apples, bananas and corn and then i cooked the same vegetables and measured the voltage again and the voltage was higher with the cooked vegetables than with the uncooked vegetables. I did this with an open ended circuit, one resistor, and two resistors. I used a voltmeter to meausre the voltage and i stuck bare copper wire in one side of the vegetable and a galvanized nail in the other.

Louise · Post by **Louise** » Mon Feb 05, 2007 7:57 am

Maurax1212 wrote:I measured the voltage of potatoes, onions, lemons, apples, bananas and corn and then i cooked the same vegetables and measured the voltage again and the voltage was higher with the cooked vegetables than with the uncooked vegetables. I did this with an open ended circuit, one resistor, and two resistors. I used a voltmeter to meausre the voltage and i stuck bare copper wire in one side of the vegetable and a galvanized nail in the other.

Okay, so what makes the voltage? Why did you use a copper wire and a galvanized nail as the electrodes? [I'm actually really surprised you got measurable results for most of these things. Back in the day, I did this project too... I only used lemons tho.]

So, what were the results for the raw vegetables? Which ones had the greatest voltage and which had the least? Is there something in common between the most voltage producing items?

Just out of curiosity, where did you place the electrodes in the corn? In the same kernel?

Louise

deleted-71447 · Post by **deleted-71447** » Mon Feb 05, 2007 9:20 am

Maurax1212,
When you made your voltage measurements, were the raw vegetables at the same temperature as the cooked vegetables? If your cooked veggies were still warm, that is another possible factor to consider.

Chris

Maurax1212 · Post by **Maurax1212** » Mon Feb 05, 2007 3:12 pm

They were still warm but only by a few degrees difference

Louise · Post by **Louise** » Mon Feb 05, 2007 4:45 pm

Maurax1212 wrote:They were still warm but only by a few degrees difference

Can you answer the questions I asked... even roughly. I think when you starting writing down the data I ask for, you will see the answer.

Louise

Maurax1212 · Post by **Maurax1212** » Mon Feb 05, 2007 5:49 pm

potato: open ended cooked- 0.064 uncooked- 0.031
1 resistor cooked- 0.042 uncooked- 0.03
2 resistors cooked- 0.039 uncooked-0.038

onion open-ended cooked-0.083 uncooked-0.039
1 resistor cooked- 0.072 uncooked- 0.024
2 resistors cooked- 0.035 uncooked-0.021

i also measured the voltage of lemons, corn, apples, and bananas

Maurax1212 · Post by **Maurax1212** » Mon Feb 05, 2007 5:52 pm

im sorry louise- i didnt see your second post until just now
i actually got the idea for my project from this website.
in the corn, i put the nail and the wire into the cob of the corn. They were not touching

Louise · Post by **Louise** » Mon Feb 05, 2007 6:15 pm

Maurax1212 wrote:im sorry louise- i didnt see your second post until just now
i actually got the idea for my project from this website.
in the corn, i put the nail and the wire into the cob of the corn. They were not touching

my keyboard is acting weird so I donâ€™t have certain punctuation marks- sorry if this is unclear
I would argue that there is no change with the potato between cooked and uncooked- you need a lot of measurements and statistics to convince anyone that 0-042 and 0-03 are different

Were these two the highest voltages- I would guess the lemon would have the highest voltage

You should read this article; http://en.wikipedia.org/wiki/Galvanic_cell

did you weigh the vegetable before and after you cooked it?

you see that the concentration of the ions are important when you cook the vegetable you may remove some water this would increase the concentration of the ions

can you guess why I think the lemon should be the highest?

Louise

Maurax1212 · Post by **Maurax1212** » Mon Feb 05, 2007 6:28 pm

yes i did weigh them before and after the cooking
the apple actually had the highest voltage
i am not sure why you would think the lemon would.
thank you for the article!
i am trying to straighten the whole project out before presenting it
would a higher concentration of ions in the vegetable result in a higher voltage?

Louise · Post by **Louise** » Mon Feb 05, 2007 7:18 pm

Maurax1212 wrote:yes i did weigh them before and after the cooking
the apple actually had the highest voltage
i am not sure why you would think the lemon would.
thank you for the article!
i am trying to straighten the whole project out before presenting it
would a higher concentration of ions in the vegetable result in a higher voltage?

I think the lemon would since it is very acidic- google for lemon Battery- it is actually quite strong

As for the ions- what does the article say- 'The Galvanic cell's metals dissolve in the electrolyte at two different rates'- so a saltier or acidic solution would create electrons faster

again i think you should have error values for your data if you want to conclude anything for the data you showed
Louise

voltage of cooked/ uncooked vegetables

voltage of cooked/ uncooked vegetables

Re: voltage of cooked/ uncooked vegetables