1. light bulb
I can’t see anything. The light bulb has stopped working.
The light bulb went on.
That light bulb is broken, I'll have to change it.
Could you change the light bulb, please?
How am I going to get this light bulb into my car?
Before the invention of the light bulb, you had to watch plays during the day when it was light outside. Before the light bulb, people did not do much at night because it was dark. Changing the light bulbs in your room can help you sleep.