Therearepolarityelectrolyticcapacitorsinthepowercircuitorif,lowfrequencycircuitpowerfilter,decoupling,signalcouplingandtimec***tantsetting,DCisolationandsoon.Theanode(positiveelectrode)shouldbeconnectedwiththepositiveextremeofthepowersupplyvoltage,andthecathode(negativeelectrode)shouldbeconnectedwiththenegativeextremeofthepowersupplyvoltagewhenusedasafiltercapacitorintheDCpowersupplycircuit.Otherwise,thecapacitorwillbedamaged.Non-polarityelectrolyticcapacitorsareusuallyusedinfrequencydividercircuit,s-correctioncircuitandstartingcircuitofsingle-phasemotor.Electrolyticcapacitorsarewidelyusedinhouseholdappliancesandvariouselectronicproducts.Thecapacityrangeofelectrolyticcapacitorsisgenerally1:33000μf,andtheratedworkingvoltagerangeis6.3ng/700v.Itsdisadvantagesaredielectricloss,largecapacityerror(themaximumallowabledeviationis100%-20%),poorhightemperatureresistanceandlongstoragetime.Thepolarityoftheelectrolyticcapacitance,noticethatthereis"-"isnegative,"ispositive"onthesideoftheelectrolyticcapacitance,iftheelectrolyticcapacitorisnotmarkedpositiveandnegative,itcanalsobejudgedaccordingtothelengthofitspin,thelongfootispositive,Theshortfootisanegative[1].)