I find it helpful to think of capacitors and inductors to be complimentary. <!-- Begin schematic: In order to preserve an editable schematic, please don't edit this section directly. Click the "edit" link below the image in the preview instead. --> ![schematic](https://i.sstatic.net/gpIZx.png) <!-- End schematic --> *Figure 1. Ideal and imperfect components.* - Capacitors store energy in an electric field. Inductors store energy in a magnetic field. - A capacitor stores energy when open circuit. An inductor stores energy when short circuited. - Capacitors lose energy through parallel leakage resistance. Inductors lose energy through series resistance. - Capacitors "like" to keep the voltage across them constant. Inductors like to keep the current through them constant. - When a capacitor is short circuited the resultant current is very high. When an inductor is open-circuited the resultant voltage is very high. >... when an inductor is disconnected the magnetic field starts collapsing inducing a very high voltage, wouldn't this voltage breaks down any transistors used in the switching from the charging to the discharging circuit? Yes it would but there's a simple solution: [![enter image description here][1]][1] *Figure 2. A simple buck converter. Source: [All About Circuits](https://www.allaboutcircuits.com/technical-articles/utilization-of-simple-converters-circuits/).* In Figure 2 S is the transistor switch. When it is switched off D maintains the current through L keeping it "happy" and avoiding a transient high voltage. [1]: https://i.sstatic.net/Evkkq.png