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here is an interesting experiment on how the darkness of different pencils affect the resistance..

<p>I am happy to see some remembers about this </p><p>I believe it still useful</p><p>have a great day</p>
<p>check my other instructable on how to make a Resistor </p><p>Link : https://www.instructables.com/id/How-to-make-a-Resistor-from-paper/</p>

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