In (Φe)'s case it's fairly clear that the "flowing quantity" is E, but if you don't mind me asking what is this "flowing quantity" in D's case?
Also could you suggest to me a textbook upon this matter ( electromagnetic fields) that contains a sufficient number of examples. Bear in mind that...
As the title states i would like to know the definitions of the above two terms. Also i would like to know the differences and a relation (if there is one) between them. I would be really grateful to anyone who takes the time to answer my probably silly questions.