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A diode may be built for high levels of current and voltage. There are diodes for low current and voltages too. They allow the ac current to flow one way and block its return. The first diode that was built a long time ago by Sylvania Co. USA, was named IN34, and could stand only very low current.

Other name for that device is a rectifier. Ancient valve tubes for radios contained a diode inside which main function was to provide cc to feed the filament of a valve. This filament had the function of emitting electrons towards the plate of the valve.

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