An introduction of photosynthesis is given in this tutorial. Towards the end of the tutorial there is an interactive session by which the source of oxygen, that is released as a byproduct, is explained.
Photosynthesis - Introduction
A description of how ATP are captured in the light reactions of the photosynthesis is explained here. It may appear a bit complex, if you are not familiar with the electron transport system.
Light Reaction - ATP formation
Two animations are given here. The first one explain cyclic and noncyclic photophosphorylation in bacteria and plant cells. This appears a bit complex, if you don't know the basics. The second animation is quite simple explanation of how ATP and NADPH are produced during light reaction.
Light reaction - ATP formation - simple
Another animation that shows ATP and NADPH formation in light reaction. This has no audio but is easy to load and the movement of electrons can be seen clearly.
Light reaction - animation
An interactive animation with a good introduction of chloroplast. The audio is given only at certain points when we click on each system in the electron transport chain. Good one.
Interactive photosynthesis
The best interactive animation of light reaction. It explains the electron transport system in photosynthesis
Interactive photosynthesis - better one
The one and only animation that explains Calvin Cycle - the dark reaction.
Dark Reaction - Calvin Cycle
