Lub capacitor yog tsim los ntawm ob lub conductors muab tso rau hauv qhov sib thooj, sib cais los ntawm ib txheej ntawm cov khoom tsis yog -conductive insulating. Thaum ib qho hluav taws xob siv hla lub capacitor ob daim hlau, nws khaws cov nqi hluav taws xob. Piv txwv li, ib tug capacitor lub capacitance yog txhais raws li qhov piv ntawm cov hluav taws xob nqi sau nyob rau hauv ib tug ntawm cov conductive daim hlau mus rau qhov voltage sib txawv ntawm ob daim hlau. Lub hauv paus ntawm lub peev xwm yog qhov farad (F). Hauv daim duab kos duab, lub capacitor feem ntau sawv cev los ntawm tsab ntawv C.
Capacitors ua lub luag haujlwm tseem ceeb hauv ntau lub voj voog, suav nrog cov neeg koom nrog hauv kev sib tw, hla, sib txuas, thiab lim. Lawv yog siv nyob rau hauv lub tuning circuits ntawm transistor xov tooj cua, raws li zoo raws li nyob rau hauv lub coupling thiab bypass circuits pom nyob rau hauv cov xim TV teeb.
Tsav los ntawm kev nce qib sai thiab tsis tu ncua hauv cov ntaub ntawv xov xwm hluav taws xob, cov pace ntawm cov khoom lag luam iteration hauv cov khoom siv hluav taws xob digital tau nrawm heev. Kev tsim khoom thiab muag khoom ntawm cov neeg siv khoom siv hluav taws xob-tshwj xeeb yog cov khoom lag luam xws li tiaj tus- vaj huam sib luag TV (LCD thiab PDP), khoos phis tawj khoos phis tawj, thiab cov koob yees duab digital- tau nce ntxiv, yog li txhawb kev loj hlob ntawm kev lag luam capacitor.