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# Fruit and Vegetable Power

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by

## Tricia Liu

on 2 December 2014

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#### Transcript of Fruit and Vegetable Power

Fruit and Vegetable Power
Purpose
We want to determine which fruit or vegetable is better in lighting 5 small 1.2 volt LED light bulbs and which one has highest voltage: pears, grapes, grapefruit, apples, limes, or potatoes.
Hypothesis
When comparing different fruits and vegetables, we believe that a potato will light up more LED lights than the other tested fruits and vegetables and have the highest voltage.
Abstract
Purpose: Have you ever wondered how you can power your house without using electricity? Is it possible to use fruits and vegetables instead? If so, which fruit or vegetable works better? The purpose of this experiment was to answer these questions.

Procedure: We used six different fruits and vegetables and tested them to see which one would light up the most light bulbs and which one will produce the most volts of energy. Each type of fruit or vegetable was tested 15 times.

Results: The apple had the highest voltage. None of the fruits or vegetables light up the 1.2 volt light bulb. The data proved our hypothesis wrong. The apple beat the potato by a rounded average of 0.1693.
Materials
Knife
3 Pears
3 Limes
3 Apples
3 Grapes
3 Potatoes
3 Grapefruit
5 Sockets
Alligator Clips
Voltage Meter
Distilled Water
5 1.5 Volt lights
Roll of Copper Wire
Copper Tube (Small)
Packet of Zinc-Plated Nails
Variables
Controlled Variables: Probes Used

Independent Variables: The Fruits and Vegetables

Dependent Variables: Voltage

Conclusion
After conducting our experiment, it has brought to an end that our hypothesis was not correct. The potato did not light up any light up any light bulbs and had the least amount of measured volts. We are guessing that the fruits/vegetables with the most water contains the most energy, because the fruits contained more volts than the vegetables. Scientifically, fruits contain more liquid than vegetables.
The averages of the volt trials we had for the lime was 0.9145. The grapefruit had a rounded average of 0.9693. The grape had an average of 0.9155. The apple had a rounded average of 1.0173. The pear had an average of 0.952. The potato actually only had an average of 0.848. Just like our theory, the vegetable in our experiment, the potato had less voltage than the fruits.
We also measured the standard deviation too. The standard deviation of the lime was 0.053541261. The grapefruit had a standard deviation of 0.015796. The grape had a standard deviation of 0.047929. The standard deviation of the apple was 0.014243. The standard deviation of the pear was 0.076923. The potato had a standard deviation of 0.046935. Standard deviation is how far the range of your data is away from the average.
We weren’t able the see how many light bulbs would light up for each fruit or vegetable, because none of the lights even lit up. The fruits and vegetables could not produce enough energy individually. In order to light the light bulb, we needed a fruit or vegetable to contain at least 1.2 volts of energy, but the highest value of volts that was ever produced was 1.04 volts.

Procedure
Data and Results
1. Gather materials.
3. Connect one LED light to another one by connecting positive to positive and negative to negative. There should be a string of 5 lights.
4. First, put the lime on a table and gently roll it around to soften it up. Have the juice flow inside the fruit without breaking its skin. (You can also squeeze the fruit with your hands instead.)
5. Push the zinc nail and copper tube into the lime. (They should not be touching each other and you should not push them through the end)
6. Using the crocodile clips, connect the zinc to copper wire. Then use another crocodile clip to connect the copper wire to the other end of the leads to the voltmeter. Read the voltage and write down results.
7. Remove the alligator clips from the voltmeter and connect them to the LED lights. (When connecting, you may have to change the leads around so that they can light up)
8. See how many light bulbs light up and record data.
9. Wash all alligator clips and the copper and zinc after each trial with distilled water.
10. Repeat steps 4-9 nine more times.
11. Now repeat steps 4-10 with each of the different fruits/vegetables replacing the lime.
12.Record all data in science notebook.

By Tricia Liu and Teresa Pan
Summary of Results

Averages

Lime 0.9145
Grapefruit 0.9693
Apple 1.0173
Grape 0.9155
Potato 0.848
Pear 0.952
Further Studies
We learned a good load of stuff from this experiment. This was not a really long experiment and was it was done in one day with no rushes . Every time we tested a different fruit or vegetable, it gave us a result we had not anticipated. We learned that fruits, on average, have a higher voltage than vegetables. We also learned that neither one of the foods we tested had enough energy by itself to light up the 1.2 volt light bulb. And most importantly, we learned the materials that must be used in order to light up the light bulb. Before conducting this experiment, we had no idea that such precise items were needed to draw the energy out of the fruits and vegetables. We also didn’t know that voltmeters even existed in the first place.
We had many questions while conducting this experiment. We wondered what all the symbols, buttons, and plugs on the voltmeter was for. We wondered if all fruits and vegetables contained energy. We puzzled over why these exact materials had to be used. Could there be more materials we could use? When the light bulb never light up, we wondered if multiple fruits or vegetables would do the trick. Under the same condition, we wondered if the light bulb we used had too many volts. Many times during the experiment, mostly while we were transferring from one fruit or vegetable to another, we wondered whether or not we washed it thoroughly enough so all the substances from the last fruit or vegetable was demolished and gone.
If we could do this experiment again, we think it would be interesting to test vegetables and fruits that not a lot of people like, including brussel sprouts and broccoli. That way, the people who listen to us present the experiment would be amazed at what great things are contained in the foods they have learned, the hard way, the avoid. We might also use different metals, like silver or gold, to test to see if that works in the place of zinc and copper. Next time we experiment, we could connect the fruits and vegetables together to produce more energy and have a better chance of lighting up the light bulb. Also, we could go online to another website to see how they did their experiment. If all of the different methods work, then one must be better than another, at least, that is what we think. If we were allowed to add a battery so it goes in a circuit, we could try that too. There might be even more energy when we add that.
We think it would be very interesting to try the experiment again and making changes to it. The results would be very different, we suppose, since every trial will always be different.

ANOVA　Test Results
*Lime
Average: 0.923
95% Confidence Interval for Mean: 0.8988 to 0.9474
SD: 0.053541261
High: 0.99
Low: 0.80
Median: 0.95
Average Absolute Deviation from Median: 0.03467
*Grapefruit
Average: 0.969
95% Confidence Interval for Mean: 0.9448 to 0.9939
SD: 0.015796
High: 0.99
Low: 0.93
Median: 0.97
Average Absolute Deviation from Median: 0.01133
*Apple
Average: 1.02
95% Confidence Interval for Mean: 0.9934 to 1.043
SD: 0.047929
High: 1.04
Low: 0.99
Median: 1.02
Average Absolute Deviation from Median: 0.1133
*Grape
Average: 0.916
95% Confidence Interval for Mean: 0.8914 to 0.9406
SD: 0.014243
High: 0.99
Low: 0.83
Median: 0.92
Average Absolute Deviation from Median: 0.03600
*Potato
Average: 0.848
95% Confidence Interval for Mean: 0.8234 to 0.8726
SD: 0.076923
High: 0.89
Low: 0.70
Median: 0.86
Average Absolute Deviation from Median: 0.02533
*Pear
Average: 0.952
95% Confidence Interval for Mean: 0.9274 to 0.9766
SD: 0.046935
High: 1.02
Low: 0.75
Median: 0.99
Average Absolute Deviation from Median: 0.04733
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