Question

what is use of glass bulb in electric bulb?canwe use electric bulb without glass bulb

Answer 1

The glass bulb is filled with an inert gas. The heat from the filament would initiate combustion reaction among the gases in the atmosphere. The presence of inert gases ensures safety from the heat from the filament too. Hence, it is not safe to use electric bulb with glass bulb.

Answer 2

An incandescent light bulb contains a thin wire filament (usually tungsten) that glows hot when an electric current is run through it. ... A glass bulb, then, is used to keep oxygen away from the filament. While a vacuum will work, any inert gas that inhibits combustion will also work.