When you switch on the contact I light up the room. Who am I?

Explanation

A lamp is an invention that in essence consists of a source of light (a light bulb) and a lampshade. The shade is the part of the lamp that blocks the light in a certain direction so you don't get blinded by the light. The lamp consists of a foot with a light socket where the light bulb is placed, the lampshade, as well as a power supply so that the lamp can be powered by electricity.