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State the principle of thermionic emission and the Edison Effect and give the reasons for electron movement in vacuum tubes. Identify the schematic representation for the various electron tubes and their elements.
Cold-cathode (field emission): electrons pulled out of material by strong positive potential. Thermionic – heated material transfers energy to electrons causing them to escape. Number of electrons depends on temperature and type of material. Almost instantaneous electron-emitting temp. AC voltage causes varying emission.
Fig. 1 - A pictorial representation of electrons moving from the cathode cylinder (-) to the plate (+) under the effect of the electric field generated by the plate battery. The double spiral heater inside the cathode supplies the thermal energy needed to accelerate electrons and let some of them to leave the cathode surface.
A vacuum tube contains two or more metallic elements enclosed in an evacuated envelope of glass, metal or ceramic material. (One of the metallic elements serves as a source of free electrons.) The more inclusive term, electron tube, describes any vacuum or gas filled device in which electrons move through space between elec trodes.
Apr 15, 2014 · Vacuum Tube Manual: Basic Theory of Electron Tubes (Army 1952) ... PDF WITH TEXT download. download 1 file . SINGLE PAGE PROCESSED JP2 ZIP download. download 1 file ...
Mar 13, 2014 · TABLE OF CONTENTS Chapter 1. INTRODUCING THE ELECTRON— 1. The Electron— 2. The Atomic Theory — 4. Matter Can be Transformed — 6. The Atom — 7. The Molecule — 8. The Atom Too is a Structure— 9. The Modern Idea— 11. Conductors and Insulators — 13. Ions and Ionization — 13. Atomic Spacing — 16. Chapter 2. ELECTRON EMISSION— 19.
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Oct 7, 2008 · – Cathode Ray Tubes in televisions and computer monitors (finally being replaced by LCD and Plasma technology) – Audio Amplifiers (both instrument and audiophile) • The basic tube includes several electrical elements sealed in a glass envelope with a vacuum or near vacuum inside the envelope.
