What are the products of cyclic electron flow during the light reactions of photosynthesis?

Cyclic electron flow uses just PS I and creates ATP.

Explanation:

Photo-system is known as light-absorbing complexes which are present on the thylakoid membrane of the photosynthetic organisms. A molecule called P700 which is present on PS l and absorb light of approximately 700 nm.

Cyclic electron flow has excited electrons from the photochemical reaction center (P700) in Photo-system I that is passed from Ferrodoxin to the cytochrome complex and back to the photochemical reaction center. Cyclic electron flow only uses PS I and produces ATP, not O2 or NADPH.

what are the two models

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current