Vacuum tube

Vacuum tube

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Credit: CHARLES D. WINTERS/SCIENCE PHOTO LIBRARY

Caption: Vacuum tubes were once commonly used in electronic devices to amplify a signal. Resembling light bulbs with a filament sealed in a glass envelope evacuated of all air, vacuum tubes work via thermionic emission. The filament releases electrons into the vacuum that are then drawn into the metal plate (anode), resulting in a current of electrons flowing from filament to plate.

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Keywords: anode, anodes, electrical, electricity, electronic, electronic tube, electronic tubes, electronics, filament, filaments, historical, history, of, physics, radio tube, science, technology, thermionic emission, triode, vacuum tube, vacuum tubes

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