means Alternating current that is it changes its polarity from positive voltage to negative voltage like ifwe have 220V AC then it changes from +ive220 and -ive=220
this changing of polarity has fix rate that is know as frequency it may be 50Hz or 60hz
Ac may be three phase or single phase
DC
means direct current, has two fixed polarities +ive and -ive, cannot change its polarity thats why it has no frequency i.e f=0Hz
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