2.1.2 diodes (Diode) is divided into two categories:
2.1.2.1 thermal diode and diode state gas
thermal diodes into a glass tube. Within comprising electrodes (electrode) is surrounded by a vacuum within a glass tube, similar to incandescent bulbs (incandescent light bulb) diodes used in the heat. Current flows through the filament, heating and heating the negative electrode or cathode. The electrodes are made from barium and strontium oxide, a metal oxide, alkaline earth. The work conditions (work function), low (sometimes used to direct heat. By using a tungsten filament. The filling, heat the cathode) heat.
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