Electronsworklike


     Actually <Electronsworklike>Dominated. When you close a circuit with a potential difference on each side of the break (switch, unpolarized PN junction, etc.), then what happens is that an electron (for the sake of this argument) is released from its covalent bond with any type of material atom (driver) that we are discussing here. 
    Typically copper or silicon, in the case of a PN junction. That liberated electron is attracted to the most positive side of the circuit and crosses along its path until it collides with another atom and releases its valence electrons, and so on. This chain reaction is called 'electron current flow', that is. current that flows from negative to positive. Now that positive ion (that first atom that released the first electron) now has a positive charge, of course, and has a "hole" where the electron should be. The negatively charged electrons are attracted by this positive ion and will try to fill that "hole". This is called "conventional current flow", that is, current flow from positive to negative. 
    The only thing that really 'flows' from positive to negative would be the 'holes'. In short, the electrons that flow through the circuit actually consist of the electrons that make up the wires, diodes, caps, resistors and anything else that makes up that circuit. The most important thing to remember is that the electrons do not materialize from nothing and that they do not "come" from the battery, per se. That helps? Happy to explain in more detail if you want, but it seemed like a pretty long publication. 
    By the way, when the electrons finally reach the positive side of the battery, they end up filling all the "holes" in the positively doped material in the battery. Once all these 'holes' are filled, the battery runs out. I'm not exactly a battery expert, maybe they're built a little differently than what I'm explaining, but the principles are solid.

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