opto electricity

hi electromaster, thanks for your reply. my supervisor now approved a topic for me wich says "opto electricity effect in fire alarm system" so i will like you to help me out with this, and i have been trying to get a solution on how to convert ac-dc inverter. thanks i'll be looking forward to your reply its me akhigbe

I don't know what "opto electricity effect" is but I suppose it could be a light or heat sensor used to operate a fire alarm. I have no idea what you mean by "convert ac-dc inverter".

https://en.wikipedia.org/wiki/Smoke_detector#Optical_detector
Just putting an optodetector out of the path of light from an optotransmitter, and smoke particles scatter the light to the detector.