That's a good explanation. Covers all the basics, including mentioning that FETs fail in the ON direction. This is why switching power supplies badly need protection circuitry, and why you don't want wall warts and battery chargers that didn't pass UL testing.<p>He mentions electrostatic discharge sensitivity. Yes. It's very easy to blow out the gate of an FET just by touching the gate lead. Once it's attached to a driver transistor, it's protected, but loose FETs need to be stored in conductive foam and handled while wearing a wrist strap.<p>FETs are really amazing. ON resistances in the milli-ohm range, and OFF resistances in the megohm range. It's surprising that's physically possible.