I know that transformer is a constant flux device but there is one point I don't understand.
As you know, when secondary of transformer is connected to a load, current starts to flow. This current produce its own flux (let's say F2) which opposes the main flux (F1). Then E1 (back-EMF primary side) decreases and extra current starts to flow in primary side and this current cancels F2 flux out and the F1 kept constant in transformer. Everything is OK by now but the point I don't understand is when F2 flux is canceled out by extra current in primary side, what happens to E1?
Does it go to beginning value (before secondary side current to flow)? If yes, so current in primary side should also goes to beginning value (by canceling extra current) right?
E1 stays decreased (at the point after secondary current flux decreases it)? If it is like this how is that possible? I mean there is constant flux in the core but E1 is smaller. Shouldn't it be the same since flux is same?