Light dependent reaction:
First, chlorophyll absorbs sunlight, which excites electrons in PS1 (short for photosynthesis 1). These electrons get passed through the thylakoid membrane, which becomes negatively charged. These electrons go to PS2 (short for photosynthesis 2). This is called an electron transport chain. Then, H+ is inserted into the thylakoid and water molecules are broken. The oxygen from the water gets released from the thylakoid. Then, both PS1 and PS2 absorb sunlight and electron start to go to the ATP synthase. These electrons help a molecule called NADP+ and H+ to combine, which creates NADPH, and also, H+ helps to bond ADP and P to create ATP. Both molecules will be used later