VegExperiments

VegExperiments

Magdalena KrausPoland

Zespół Szkolno-Przedszkolny w Bestwince

Lemons Under Voltage

Materials needed to conduct the experiment with lemons and an LED: Lemons – 4-5 pieces. LED diode – 1 piece. Wires – several pieces of copper wire, about 10 cm long each. Zinc nails – 4-5 pieces (zinc coins can also be used). Copper nails – 4-5 pieces (copper wire pieces can also be used). Multimeter – for measuring voltage (optional). Hypothesis: If we place zinc and copper electrodes in several lemons connected in series, they will generate enough voltage to light up an LED diode.

Procedure: Prepare the lemons; make small cuts in each lemon, but do not cut them in half, just make small incisions to make it easier to insert the electrodes. Insert one zinc nail and one copper nail into each lemon. Connect the lemons in series by connecting the zinc electrode of one lemon to the copper electrode of the next lemon using wires. Connect the first free copper nail (positive electrode) from one end of the series-connected lemons to one leg of the LED diode. Connect the last free zinc nail (negative electrode) from the other end of the series-connected lemons to the other leg of the LED diode. Check if the LED diode lights up. If it does not, try reversing the polarity of the diode (swap the wires connected to the legs of the diode).

Conclusion: If the LED diode lights up, it means that the lemons generated sufficient electrical voltage due to the chemical reactions occurring between the electrodes and the citric acid. This confirms that citrus fruits can be used as a power source in simple electrical circuits. If the LED does not light up, it may indicate that the voltage generated by the lemons is too low or that the electrical connections are not good enough.

Cordean Gordan Diana Maria Romania

Children`s World Kindergarten, Gradinita cu p.p. Lumea copiilor, Cluj-Napoca, Romania

THE POWER OF WORDS

Starting from two almost the same apples, the children addressed negative words to one apple and then positive ones to the second one. The „hurt" apple oxidized, but the second one remained fresh.

Veneta Kehayova Bulgaria

ДГ“Снежанка”,Рудозем, Bulgaria

An experiment with tangerines, with and without a peel, in the water.

Required materials: 2 tangerines, one peeled. 2 clear glasses of water. When immersing the tangerines, the peeled one sinks and the one with the peel floats on the surface. The peel acts as an air cushion.

Petcu Nicoleta, România

Liceul Teoretic”Mircea Eliade” Galați

The students performed experiments using orange and cinnamon cloves. They achieved a pleasant room fragrance.

Romana Rašić Croatia

Dječji vrtić Travno, Zagreb

Materials used:

• rocks
• water
• white turnip, parsnip & beets

Root vegetables continuing to live in the water after being cut in half.

Dumitru CorneliaRomania

Liceul Teoretic”Mircea Eliade” Galați

Materials used in the experiment: - 3 white flowers (carnations, chrysanthemums) - 3 bowls of water - food coloring of 3 different shades

Through our experiment, we wanted to highlight how plants feed themselves, the fact that they, like other animals, have a system of vessels through which the sap circulates. That's why, if we put dye in the water in which the flowers stand, the vessels in the flower end up getting colored, giving the flower interesting and attractive shades.

Evangelia Tsiara Greece

Kindergarten of Kivotos, Grevena

We made our experiment using an orange and a bowl full of water. First of all, children predicted if the orange would sink or float and why. We put it in the water and we observed that it floated. Next, we peeled the orange and we predicted what would happen and why. We put the orange in the water and we observed that it sunk. Finally, we discussed the result of the experiment.

Eugenia KiriakoudiGreece

37th kindergarten of Thessaloniki

THANK you!