Previous video: https://www.youtube.com/watch?v=pxNLTRl36HQ Facebook: https://www.facebook.com/greatscottlab Twitter: https://twitter.com/GreatScottLab Support me for more videos: https://www.patreon.com/GreatScott?ty=h In this video I will explain why coils/inductors are so important in different DC circuits. I will talk about magnetic fields (MF), induction, Lenz Law and inductance. The example circuits include: boost converter, buck converter and flyback diode protection.