Photosynthesis occurs in two stages in a cell. In the first stage, light-dependent reactions take the suns light and use it to make the energy-storage and transport molecules ATP and NADPH. The light-independent Calvin cycle uses the energy to convert carbon dioxide and water into organic compounds that can be used by the organism and by animals that feed on it.
This is the electron transport. It is a light dependent reaction. It takes in sun light to turn it into ATP and NADPH. The light-dependent reactions begin in photosystem II.
When a chlorophyll molecule absorbs a photon, an electron in this molecule gets "excited" and since this is unstable it is transported and this creates a electron transport chain. It then goes through to create ATP and NADPH to use in the light-independent reactions.
This is the Calvin Cycle, it is a light-independent reaction. These reactions occur in the stroma, which are in the chloroplast. It takes six turns to make one glucose. Despite it's name plants can only do the calvin cycle when light is available.
Using the ATP and NADPH produced by the light-dependent reactions, the compounds are then reduced and removed to form carbohydrates, such as glucose and oxygen.