Hi, I have a super capacitor that is charged at 100,000+V at 0.1uF. Naturally it wants to give of its energy instantaneously in a spark; but im trying to find a compound or semiconductor that can regulate the output of electricity from this capacitor without wasting the majority of the energy as heat. I've envisioned a semiconductor that only lets x current through with a source at 100,000+V, but once the cap voltage drops low enough, there wouldn't be enough voltage to flow across the semiconductor. This "wastes" the rest of the energy in the cap which defeats the purpose. I'm asking if there is an existing compound or semiconductor that can regulate its conductivity in a wide enough range to make the output voltage low enough at a near constant rate to be useful (~1-200V range). A transistor comes to mind, but to my understanding, its range of conductivity is not wide enough to be 'useful'.