Lub phaj cathode yog ib qho tseem ceeb hauv ntau yam khoom siv hluav taws xob, nrog rau cov roj teeb thiab lub tshuab nqus tsev. Nws ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm cov khoom siv no los ntawm kev muab cov hluav taws xob tsis zoo uas nyiam cov ions zoo lossis cov khoom siv hluav taws xob.
Hauv lub roj teeb, lub phaj cathode yog qhov zoo tshaj plaws uas tau txais electrons los ntawm lub phaj anode. Cov electrons tom qab ntawd ntws los ntawm ib qho hluav taws xob sab nraud, tsim hluav taws xob tam sim no uas ua rau lub zog ntawm lub cuab yeej.
Nyob rau hauv lub tshuab nqus tsev vacuum, lub phaj cathode emits electrons thaum rhuab, uas ces ntws mus rau lub zoo charged anode phaj, tso cai rau lub amplification thiab nrhiav kom tau cov teeb liab.
Zuag qhia tag nrho, lub phaj cathode tso cai rau kev hloov pauv tau zoo thiab kev tswj xyuas cov nqi hluav taws xob, ua rau nws yog ib qho tseem ceeb hauv ntau yam khoom siv hluav taws xob.
