Question

what is a Vacuum tubes​

Answer 1

A vacuum tube, an electron tube, valve (British usage) or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. ... Electrons can only flow in one direction through the device—from the cathode to the anode.

Answer 2

Thnks for points.

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An electronic device that controls the flow of electrons in a vacuum. It is used as a switch, amplifier or display screen (CRT). Used as on/off switches, vacuum tubes allowed the first computers to perform digital computations.

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