[Potironette]

Err, do you mean the bottom layer has electrons that can move, and when a photon makes an electron move away, the electron in the bottom layer moves up--and because it moves it, it is now positive, attracting the electron that got knocked out by a photon? Aand somehow the middle layers only allow electron movement from the bottom to the top..?

And thank-you very much for that explanation on household power!