thermionic valve

Found in Anh - Anh (Wordnet)

Definition Noun : * Thermionic Valve : An electronic device that controls the flow of electric current in a high vacuum between electrodes to which an electric potential difference has been applied. It operates on the principle of thermionic emission, where a heated cathode emits electrons that are attracted to a positively charged anode (plate). It is a fundamental component in early electroni...