Why does the light in the refrigerator come on when you open the frig?

The light in the refrigerator comes on when you open the door due to a simple electrical switch mechanism. This switch is typically activated by the door opening, completing the circuit and allowing electricity to flow to the light bulb. It automatically turns off when the door is closed, conserving energy. This design ensures that you can see inside the fridge without needing to manually switch on the light.