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Does it move again to the negative terminal or stays at the positive terminal until the electrons all come .so the voltage will.be zero and current flow .I want simple clear explanation because i am confused .when I see a circuit that has two batteries one charging the other so I don't know how to think about it .i guess that electrons come from the negative terminal of the battery of higher emf to the negative terminal of the battery being charged and stay there but if this happen how the current moves to the positive terminal of the battery of higher emf.

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Generally charge (negative) moves from anode to cathode and the chemical reaction in the battery is mediated by a salt bridge (may be different for various battery types). The salt bridge keeps the charge of the total system from separating completely and, in effect, slows down the electro-chemical reaction so that the battery isn't depleted almost immediately. This means that once charge moves through the loop there exists an unbalanced charge distribution in the entire system. The salt bridge supplies ions to the electrolytic solution to maintain neutrality but does not move individual electrons. Without the salt bridge there would be no way for charge to continue to flow and supply power to any connected load. This means that although some electrons may be transported through the salt bridge to move through the loop again the majority complete the loop once and either remain at the cathode, or bind to an atom to become a anion and are absorbed by the salt bridge.

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  • $\begingroup$ If your answer is right ,so how the battery is used up and it's voltage decrease If the electrons go back to the negative terminal $\endgroup$ – Momo Sep 2 '17 at 22:01
  • $\begingroup$ i have learned in chemistry , that any battery is made of negative electrode and positive electrode and an electrolyte .the electrons goes outside the circuit from the negative electrode to the positive electrode. and the current stops when the negative electrode dissolved completetly $\endgroup$ – Momo Sep 3 '17 at 14:42
  • $\begingroup$ so i deduced that electrons stayed there at the positive electrode $\endgroup$ – Momo Sep 3 '17 at 14:42
  • $\begingroup$ i have read The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. The electrons wants to rearrange themselves to get rid of this difference. But they do this in a certain way. Electrons repel each other and try to go to a place with fewer electrons. In a battery, the only place to go is to the cathode. But, the electrolyte keeps the electrons from going straight from the anode to the cathode within the battery $\endgroup$ – Momo Sep 3 '17 at 14:43
  • $\begingroup$ I've changed my answer to reflect some new knowledge. The electrolyte supplies the electrons and the salt bridge absorbs and supplies anions and cations if there is an excessive buildup on either side of the battery. $\endgroup$ – eisi0523 Sep 4 '17 at 17:32

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