In this YouTube video, a fellow runs 10 amps through a cylinder of pencil graphite, burning his fingers (accidentally on purpose, I'd say).
He has a good article about graphite on his site:
Graphite is highly conductive unlike diamond or wood. But it is conductive along the layers, not perpendicular to them. It has many different applications. Generally it is crushed into powder that can be used to make other components like battery rods, deposited traces on electronics and such.
But pencils are the most basic use of them. If you draw a thick line using pencil on paper and measure the resistance across it, you will see your line is conductive, and if you bring your probes closer on the paper over the line, the resistance gets lower, like a potentiometer.
Even what’s billed as the world’s largest lemon battery can only generate enough juice to charge a small battery cell, so Mark Rober tries a few other fun power generators with a bunch of young scientists-to-be.
Ever wanted to build your own voltage generator for fun and profit? YouTuber ElectroBOOM shows how with stuff that available at better hardware stores.
Tim from Grand Illusions dusted off a decades-old carbon arc lamp to show how it works, and how to create colorful and hypnotic pulsing patterns.
Studies have shown cannabidiol (more popularly known as CBD) to be effective in two main areas: Pain relief and stress relief. Both of those make the non-psychoactive, cannabis-derived compound a natural for topical creams. There’s no shortage of CBD products out there, but here’s eight of our favorites, all specifically designed for dermatological use – […]
If you’re part of the maker community, you know Make:. Though Make: magazine is off the shelves as of this year, the eBooks and resources put out by Maker Media are still a fantastic resource for the new generation of tinkerers, hackers, and robotics geeks. If you’re in that tribe, listen up: they’ve released a […]
Life isn’t getting any less hectic, and pressure cookers are a quick, healthy solution for a growing number of kitchens. But if you thought your Instant Pot was versatile, there’s a major upgrade on the market: The Yedi 9-in-1 Total Package Instant Programmable Pressure Cooker. If you’ve somehow never used a pressure cooker before, try […]