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Electrons and flow of electrons – Did you have this doubt before?

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“When an electric cell is connected to a circuit, electrons flow away from the negative terminal in the circuit. But within the cell, electrons flow to the negative terminal. Explain?

Answer: The question seems to be the result of some misconceptions. If we consider an electrochemical cell, it is the chemical reactions which develops and maintains the potential difference between the terminals of the cell. When externally connected, the electrons flow from the negative terminal (at lower (+) potential, to higher(+) potential). When the electrons start moving, the potential difference tends to decrease and therefore chemical reaction starts/speeds up to keep the potential difference constant.

But as the movable charges inside an electrolyte are ions, they cannot move as freely as the electrons in a metal. The opposition to the movement of ions results in a resistance inside the cell itself and is called internal resistance.

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