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Vacuum tubes are also called valves because they regulate the flow of electric current in a circuit, similar to how a valve controls the flow of liquids or gases. This terminology is particularly used in British English, where “valve” describes their function as devices that open or close to allow or stop the flow of electricity. The term highlights their role in controlling electrical signals, akin to how a mechanical valve manages fluid dynamics.
B. because they can stop or allow the flow of current
B. because they can stop or allow the flow of current