Ib qho inductance coil, tseem hu ua inductor, yog cov khoom siv hluav taws xob passive tsim los khaws lub zog hauv qhov chaw sib nqus thaum hluav taws xob ntws los ntawm nws. Nws muaj cov hlau qhov txhab rau hauv lub kauj, feem ntau nyob ib ncig ntawm cov tub ntxhais ua los ntawm cov khoom xws li hlau, ferrite, lossis cua. Lub luag haujlwm tseem ceeb ntawm inductance kauj yog tawm tsam kev hloov pauv tam sim no, cov cuab yeej hu ua inductance, ntsuas hauv henries (H).