In the first video, we tapped on the matchbox. You can also speak to it. Although you have to speak in a very loud voice, otherwise the no sound is able to be recorded.
The second video contains the sound we recorded by using smart phone.
Results, Problems and Reasons
1. Thin pencil lead - unsuccessful
During the experiment with thin pencil lead, we had a concern about the thinness of the lead would be a major cause of this failure. Unluckily, we have proved that we were right about our concern. We thought, the main reason is the resistance of the electric conductor (pencil lead) is too large, which caused our experiment to fail.
2. Thick pencil lead - successful
After the recent failure experience, we had switched to a thick pencil lead. This time, our experiment had succeeded! The two videos above reflect our result.
3. Lemon as battery - unsuccessful
With excitement, we moved on to build the lemon power generator. Unfortunately, the result was not as what we had predicted. We could not hear any sound coming from the headphones.
In order to find out the reason that causes this problem, we did some scientific research. We found that the correct procedure to generate electricity from a lemon is to insert a piece of zinc metal and a piece of copper into the lemon, then connect with wires. But we did not insert any zinc metal. So this must by the part we had done wrong.
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