Mcoils article was much longer, but I never made the GIF diagrams for the second half.  Do this:  make a small half-inch parallel-plate capacitor with a 10ft thick dielectric.  Use the insulating dielectric as an &quot;AC conductor.&quot;  Break it in two to form an off-switch, and force the fractured ends back together to complete the circuit.<p>I do have a short piece of PZT piezo ceramic rod from eBay.  But I still haven&#x27;t tried using it to complete an AC circuit, or even stuck it on top of a Tesla coil.  At high freqs, high-K piezo-ceramic insulators are a good conductor: a long, long filament of capacitor-dielectric which, in theory, can be wound into an AC electromagnet coil ...made of insulator.   (Or, when put on top of a Tesla coil, I expect sparks to shoot out of the insulating ceramic tip!)   But not nearly as fun concept as electro-electret solenoids that should attract rice crispies and small bits of paper.<p>I did build the chain-of-rings transformer, the waveguide for 60Hz.  In a surplus shop I found a handful of big transformer cores; those tape-wound split-core type.  I could pass copper rings through these (made some #10-gauge wire loops), using cable-ties to clamp the C-cores into closed rings.  I drove one end of the chain with 1000 amps from a soldering gun tip.  The other end was 30 turns of wire-wrap wire, and would light up a little 3v pilot light.   I think there were six iron cores and five copper rings in the chain.<p>Of course if you want the ultimate chain, you&#x27;d need alternating rings of piezo ceramic and ferrite.  Figure out how much horsepower could be sent along the floppy chain before it started heating up too much!<p>Handy note: if you need ~1000 amps AC for anything, just screw a short loop of #12-gauge solid wire into the end of your 300-watt soldering gun.   Make a little loop coil, use it to demagnetize your screwdrivers.    It&#x27;s not 1000 turns of one ampere, it&#x27;s one turn of 1000 amperes.   Pass the conductor through a pair of tapewound C-cores and they slam together with 100s lbs force.   (Measure it with a clamp-on ammeter, if your ammeter goes that high.)<p>For my next trick, I will shoot a smoke-ring made out of Luminiferous Aether across the room.   But first I&#x27;ll need a big deep hat, from which I&#x27;ll have to pull two new Maxwell&#x27;s equations!  :)