Area 42: LED Flower Lights When Watered

Do you know how batteries work? And a battery of lemon, have you seen close up? In Area 42 this week, we will build a “flower” capable of lighting an LED only with lemon juice.

This experience is very interesting to understand how the batteries work; And best of all: it’s quick and easy to build. The materials are simple and it is likely that everyone will have everything at home.
If you usually watch Area 42 and find the projects difficult, this time you have no more excuses!
Let’s go to the list of materials needed.Area 42: LED Flower Lights When Watered

Materials

Lemons;
10 galvanized nails;
10 peeled copper wires with 60 centimeters each;
1 red or yellow LED;
Paper towel;
1 barbecue stick;
1 stopper;
1 small flower pot with earth or sand.
Nails can be any size, however, the larger they are, the better the result. The copper wires we use are those found within common network cables.
Important : Do not use enameled copper wires, such as those we have already used on the crepe tape speaker, for example.

Start Of Assembly

Preparing The Energy Cells

To get energy to focus properly, you have to build 10 energy cells and connect them in series to each other; So let’s start with the construction of these parts.
The first step is to cut a paper towel strip so that it can be wrapped around the nail.
The width of the nail should be less than the total length of the nail.
After positioning the paper, we should wrap the copper wire over it, making sure to keep a piece of yarn left at the end near the nail head.
We must repeat this process with the remaining nine nails.Area 42: LED Flower Lights When Watered 1

Mounting The Battery

With all 10 energy cells ready, we need to fasten them to the body of the cork, making sure to keep a similar space between them. In this way, each of the nails will be a petal of our flower.
After all the nails are stuck in the cork, we will connect the cells together to complete the assembly of the battery.
To do this, we connect the copper wire from the first nail to the head of the second nail, and so on, until all of them are connected.
The logic is as follows: the wire wound on top of the paper towel will be the positive pole of the battery, while the body of the nail is the negative pole. Knowing this, it is important to make sure not to touch the copper wire of one cell in the copper wire of the other, as this could cause a short circuit.
When all 10 nails are connected to each other, we must have two unconnected sites: the copper wire of the tenth nail and the head of the first.
The copper wire of the tenth nail should be attached to the larger (positive) stem of the LED. The smaller (negative) LED rod should be attached with a copper wire to the head of the first nail, completing the circuit.
To finish, we will stick the barbecue stick at the base of the cork and position our flower in the pot of plants, which in our case is a plastic cup with sand.
Now, just supply the “fuel” so that the energy cells can start the chemical process that will generate enough energy to power the LED.
We put the lemon juice in a syringe to facilitate the distribution of the liquid.

Why Does This Work?

When we drip the lemon juice in the cells, the acidity begins a process of reaction with the two metals – the copper and the zinc. With this, the atoms of a metal can pass to the other, through the lemon juice. As these atoms move, they lose electrons. These electrons run through the wires, producing electricity.
In our experience, we were able to make the battery with ten cells of power generate about 1.8 volts, enough to power a red LED.
How many energy cells of this kind would it take to create a cell phone charger powered by lemon juice? Do you think this is possible?Area 42: LED Flower Lights When Watered 2

Join Area 42

Would you like to participate in Area 42? You can do this in two ways. The first is sending suggestions and ideas, and the second is sending pictures of projects that you built with what we show here.Remember to caprichar in the photos and send along your full name, age and city.
Send an email to: [email protected]

Participation Of Readers

The first participation this week is that of Carlos Eduardo. He liked the smartphone speaker and decided to build his own model.
Thiago Clauter modified the notebook support design, adding more pieces to ensure the firmness of the set.Area 42: LED Flower Lights When Watered 3

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