> Why? A burned-out bulb fails closed not open. In electrical circuit terminology, "open" means "not connected" while "closed" means "connected/shorted". That

> 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].