Therearepolarityelectrolyticcapacitorsinthepowercircuitorif,lowfrequencycircuitpowerfilter,decoupling,signalcouplingandtimec***tantsetting,DCisolationandsoon.Theanode(positiveelectrode)shouldbeconnectedwiththepositiveextremeofthepowersupplyvoltage,andthecathode(negativeelectrode)shouldbeconnectedwiththenegativeextremeofthepowersupplyvoltagewhenusedasafiltercapacitorintheDCpowersupplycircuit.Otherwise,thecapacitorwillbedamaged.Non-polarityelectrolyticcapacitorsareusuallyusedinfrequencydividercircuit,s-correctioncircuitandstartingcircuitofsingle-phasemotor.)