How electric current flows through solids?
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When a voltage is applied across electrodes placed in the electrolyte, the ions start moving in an orderly fashion. The positive ions move towards the cathode (negative electrode) and the negative ions move towards the anode (positive electrode). Their flow constitutes a current through the electrolyte.
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In solids, the positive charges are associated with atomic nuclei. As the nuclei are firmly packed and closely held by inter- atomic forces. therefore, positive charges cannot drift.
On the other hand, negative charges are not held firmly. This, when a potential difference, however small, is applied they start drifting from higher to lower potential
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