sentence: Most light bulbs fit into a socket.
sentences_after: If the socket is turned on, there is electricity there, even if the bulb is out, so there is danger of electric shock. Most bulbs get very hot when they are turned on, and take some time to cool off. Most light bulbs are made of glass, which means that they can break easily. Fluorescent bulbs contain a small amount of mercury, if they break, be careful to not breathe the mercury vapor. With incandescent light bulbs, the filament will eventually break, and the bulb will need to be replaced.
concept_name: light bulb
headings: Lightbulb Cautions
categories: Light sources Machines Home appliances