Hacker Newsnew | past | comments | ask | show | jobs | submitlogin

Why? A burned-out bulb fails open not closed.

If it failed closed then a bulb burning out would trip the circuit breaker.



> Why? A burned-out bulb fails closed not open.

In electrical circuit terminology, "open" means "not connected" while "closed" means "connected/shorted".

That's different from direct translation of Chinese (and I think several European languages) where "open the light" means to turn it on (by closing the circuit, naturally).

I think it's most common English engineering usage (by far) to say that a burned out lamp fails open [circuit].


Whoops, sorry, I had them reversed!


Interesting/random side note: modern mini Christmas light bulbs do burn out (mostly) closed: https://www.youtube.com/watch?v=0MOpfT0f7bQ&t=179s


To close a circuit is to connect it, correct? So when the filament burns out, the circuit breaks, which is an open circuit, correct?




Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: