what is vaccum tube ?
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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.
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hey hear is u r answer
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A vacuum tube is a hollow glass cylinder containing a positive electrode and a negative electrode between which is conducted in a full or partial vacuum. A grid between these electrodes controls the flow of electricity. When the filament is sufficiently heated by an electric current, it emits electrons.
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