Taw qhia rau cathode txoj sab ci
Lub tshuab hluav taws xob ntws los ntawm cathode ntawm qhov qis-siab roj tawm lub raj xa hluav taws xob yog nrawm los ntawm hluav taws xob teb. Lub cathode tuaj yeem ua txias lossis kub. Cov xaim hluav taws xob tau tawm ntawm cathode los ntawm kev tawm ntawm lub tshav hluav taws xob los ntawm cov hluav taws xob sab nraud, kev sib tsoo ntawm cov ions zoo nyob hauv cov roj tshuav, lossis thermionic emission.