this post was submitted on 14 Feb 2026
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The teacher was explaining about conducting and not conducting, and we had a battery with lamp thing to test on various objects. I of course had to test this on a pencil and discovered semi-conducting. That was a serious "not today" sigh from the teacher.
How did that work?
Doesn't pencil lead material just work as a resistor? It's mostly graphite and clay, and shouldn't have the required structure to work as a semi-conductor.
Ahh right. I had forgotten about how to term "semi-conducting" was used back in elementary, thanks to semiconductors and the lot.
In my case it gave off a few sparks at the contacts what really makes it interesting for young me.
Everything is a conductor if your generator has a high enough frequency.