[just the part of the circuit that I need...]
The resultant emf will be twice as the previous identical emf.
If we reverse any of the the two cells (I mean let the negative side of one cell face the negative side of the other), what happens then? If the two cells were of different emfs then the current would have followed the magnitude and direction of the cell which has greater emf. But what if the cells are of the same emf?
Now for the parallel connection of cells, I really don't have any idea what happens except for the fact that when they are of the same emf, they behave like one cell but provides longer life of batteries. I will want to know about the following circumstances :
(1) What happens in this picture? (2) What happens if the emfs are not the same (in the same picture)? (3) What if the orientation of the cell's - and + sides were the same and they were of different emfs?