what is a optoisolator?

[Souper man]

I was wondering what any kind of optoisolator is and how it works

 

[RadioRon]

I was wondering what any kind of optoisolator is and how it works

here's an explanation:
https://en.wikipedia.org/wiki/Opto-isolator

 

[HarveyH42]

What is a 'search-engine', like Google? How does it work? Can you actually learn stuff by using it?

 

[Sceadwian]

Fully half or better of all the posts in the forums here could be answered via google or wikipedia.

 

[HarveyH42]

Wonder why? My browser has Google on the tool bar, quicker response, less typing and sarcasm.