How does a car headlight work?

The basics of car healights are the same as a household light bulb. The electricity flows from the source, through a switch, to the bulb and the bulb has a wire in it that heats up and gives off light. The bulb is sealed to keep air out so that the wire inside does not break when it gets hot.

There are some different things in cars though, they can have sensors built in that can make them come on by themselves when it gets dark. They can have sensors that turn on and off high beam headlights that allow the driver to see more when no other cars are approaching. They can have high intensity and special light sources.