The spell checker doesn't seem to know many common electronic terms. This is quite surprising for an electronics forum. Is there a library file somewhere that can be updated with common electronics terms such as inductor, MOSFET, ferrite, and I'm sure many others?
AFAICT, spell-checking is entirely a function of your browser and its underlying OS, and has nothing to do with StackExchange per se.
In other words, if you want to change its behavior, you need to investigate how to change the settings in your browser and/or operating system.
No you can't blame google chrome, at least not directly. You'll have to look further and/or deeper into language settings and spelling dictionaries, possibly even saved mipsellings of words. Oh no!