- noun a device made of two electrodes and an electrolyte that allows electric current to flow in only one direction
- A rectifier incorporating two electrodes, each of a different material, immersed in an electrolyte. The selection of the appropriate electrodes and electrolyte creates a polarizing film on one of the electrodes, which effectively allows current to flow only in one direction. An example of such an arrangement would be an aluminum electrode along with a lead electrode in a sodium bicarbonate solution.
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