Graphite is an electrical conductor, hence useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromatically). These valence electrons are free to move, so are able to conduct electricity
A piece of paper
A graphite pencil (not the #2 pencils you used at school when you were a kid, but what “artists” use that’s pure graphite. If you don’t know what I mean by that use the picture above for a reference. Also, if you still go to school you may be able to borrow one from your art teacher).
A battery or electrical source
An LED or other electronic
Tape (optional, and it’s to hold down the battery wires or LED to the lines)
Volt meter (also optional, just so you know if a current is running through the line and how much)
How to Make the Circuit:
This is perhaps one of the easiest projects you may find on intractables to complete. It’s as simple as drawing the circuit onto a piece of paper, and then connecting the battery and LED to the circuit, and you’re done! You want to be sure to make the lines plenty thick when creating the circuit though, so that it’s a large path for which to allow electricity to flow through it. You should pass over the same line five to ten times roughly, dependent on how hard you push on the paperIt’s also best to draw a circle on the side where the battery and LED connect to the paper. This greatly helps with the flow of electricity, producing a much better current.
Why its works
Graphite, although a poor conductor, is still a conductor, thus has the ability to conduct electricity. longer the line is. Its most common use (that involves electricity) is in resistors, which is why its ability to conduct electricity drops greatly the longer