Part 2/9:
Paul begins by explaining a bit about what an electret is. While he doesn’t delve into exhaustive technical specifics here, he recommends looking it up on Wikipedia for a comprehensive understanding. Essentially, an electret is a material—often a dielectric—that has been treated to retain a quasi-permanent electric polarization, akin to a magnet but with electric charges. This polarization is achieved by applying heat and a high voltage DC current, resulting in molecules lining up with north-south polarity, granting the material unique properties suitable for energy storage or conversion applications.