![]() The space charge exerts a repelling force on the electrons emitted from cathode. When a metallic cathode is heated sufficiently an invisible cloud of electrons is set free in the space to form a space charge. These negetive charges are either attracted/repelled at the anode,depending on whether the anode is positively/negetively charged. Electrons emitted from cathode are negetive charges, you know that. ![]() Anode surface may be blackened and roughened for the same purpose of easy heat removal.īasic law of electricity is the basic operating principle of a vacuum diode, which is nothing but “like poles repel and opposite poles attract”. ![]() The anode is made larger to dissipate heat without excessive rise in temperature.Usually cooling fins are fitted with an anode for removal of the heat produced at the anode. This is because at high power nickel or iron may deteriorate. Oxide coated cathode shows greater emission efficiency.Īnode is usually a hollow metallic cylinder,it can be of nickel or iron but in case of high power tantalum, molybdenum or graphite may be used. It can also be a nickel tube coated with barium oxide or strontium oxide. Cathode may be a simple filament of tungsten or thoriated tungsten. Cathode serves as an emitter of electrons where as anode serves as a collector of electrons. Two electrodes are there for a vacuum diode known as anode and cathode. The simplest form of the electron tube for the production and control of free electrons is a Vacuum diode. ![]() Vacuum Diodes-Applications and Construction ![]()
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