There is a continuous flow of electrons from to nadph

there is a continuous flow of electrons from water to NADPH.

Explanation:

In photossinthesis, Solar energy produces photochemical oxidation (electron output) of H20 (water) due to the existence of excellent electron donors and receptors, where their final receptor is NADP +, which is reduced to NADPH and O2 is released. Photosynthesis brings together two processes, the luminal reactions that occur when the plant is illuminated, and the obscure reactions of CO2 fixation (Calvin's cycle) that occur in both light and dark environments.