What you need to know about valves (1)
The simplest kind of valve, and the one that inspired the name, is the two-electrode type or diode (from the Greek dis, twice + electrode). In essence this consists of a filament, not unlike that of an electric lamp, around which is mounted a metal plate in the form of a cylinder or flat box, the whole being sealed into a glass bulb and evacuated. When the filament is lighted by means of a battery or a source of low voltage AC it emits negatively charged particles of electricity called electrons. If another battery of, say, about 30 V is connected with its negative terminal to one side of the filament and its positive to the metal plate a current will pass between them; however, if the battery connections ...
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