I realize it creates a kind of pressure that is the current. But lets say that it is charging a DC battery, in an over simplification, the photons are creating pressure on the electrons and the electrons move into the battery creating more negitive ions in the battery - not increasing the potential difference. My question is - Doesn't the voltaic panel run out of electrons? And if not why? The electrons are not making a circut are they? I don't understand. Please Register or Log in to view the hidden image! Aren't we pushing the electrons out of the material of the panel and pushing them into the battery?