Melting aluminum with an electromagnet.
hakushokuwaisei can you explain what is going on pls?? i durrnt kno whut exactly is happening but it kinda looks like maybe there’s a dc voltage source tht i can’t see which is creating a lot of heat dissipation which is in turn heatin up the aluminum???
Aweigh the science tumblr team, aweigh.
Okay, so this is an induction coil, really.
As is known and taught in most classrooms, when an electrical current is passed through a wire, it makes a magnetic field that runs perpendicular to the direction of the current. Simple, right? It is how electromagnets work. You can make them with a coil of wire and a battery, connected at either end of the coil. The more coils, the stronger the field created.
But, this also works when you increase the amount of electricity passing through the circuit. You see how the wires of this are so thick? Well, if you know Ohm’s law, you’ll know that the thicker the wire, the less electric resistance(measured in ohms, it also depends on the material of the wire) it has. This wire is pretty damned thick, nothing like ones you’ll see in your wall(or your mouse wire, laptop’s powersupply, etc.) Partially because copper conducts a lot of electricity very well and you don’t need that capacity. Odds are this coil has about 100Amps in it at a pretty high Hertz.(the rate that the electricity oscillates back and forth. Which means it is more likely AC power, or the metal would just spin more than heat up, though it still may be DC)
The oscillation of electricity works a lot like it does in your microwave( video I’ve started it at the time of the info I’m referencing, but watch it all, if you like). The oscillating magnetic field causes the metal in it(and it works on metals, it would not work on, say, your steak or whatever. Though, if it was insanely strong, it could warm the iron in your blood a bit, I suppose. I’ve never had it happen. okay, getting off track) This heats up the metal as a whole. You can see it glow as it gets hot. It stays in the coil because aluminum(and I’m assuming that is what this is, given the original poster) is paramagnetic. In a strong enough field it is susceptible to magnetic fields noticeably. If you want to see some cool stuff, look up “eddy tubes”, they’re pretty neat.
Eventually though, it gets hot enough it melts, at which point the magnetic field is not enough to keep it floating and it falls to the ground in a molten heap. Can’t be too hot though, if it is aluminum, though the cherry colour makes me think it is, since melted aluminum has fairly low cohesion, which means it doesn’t stick to itself very well as much as it would stick to many other things, and it stays together very clearly, not like it falls and splatters.