In the Light Dependent phase of photosynthesis, light strikes Photosystem II, causing the electron to become excited. The excited electron bounces up to an electron acceptor, and is then passed down the electron transport chain. As the electron goes down the ETC, the electron
loses energy. The energy released is used to produce ATP. At the same time, light is hitting Photosystem I, which makes it's electron's excited. The electrons are passed to another electron acceptor and another ETC. …
