Can anyone identify this component? It came from a small night-light, which plugged into a wall outlet (US 120 v ac). There were no resistors, nor was there any rectifier. It lights up when plugged in, and it claims to consume 0.05w. It is shown with a pencil for scale, and it made of some kind of thin film.
Looks like and EL panel. EL= ElectroLuminescent. They glow when they have a sufficient electric potential across them. They do not consume much power, as they act like a capacitor. Your's may have a built in diode, or they are just relying on the small capacitance to not pass much current.