Hi again,
There's always a little confusion regarding conventional vs electron current flow. Electron flow is the usual true physical view, but conventional current flow is most often used for circuit analysis. You'll note that the transistors emitters point in the direction of conventional current flow. The electrons are considered to flow in the opposite direction through. So it depends which method you prefer here, either one will do, as long as you dont switch to another method during the analysis of a given circuit.
Electrons are said to constitute the real current flow, but holes are said to flow in the other direction, so again pick one and go with it and dont let this bug you too much. It's a little different than water flow in a hose obviously, but water is a physical entity and electrons and holes are not quite the same because after all electrons are sub atomic particles and as such they are not like anything we are used to dealing with in real life. It would be very very roughly like trying to follow every single molecule of water in that hose rather than just assuming that simply the water flows from one end to the other. It would be sort of pointless to try to do that because we are mainly concerned with what that water can do for us as a whole, so we ignore the tiny parts that make it up. Electrons flow in a complete circular path though, but the idea is basically the same.
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