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That's a "direct" current.
Yes, there is. AC = Alternating Current, the direction of the current alternates, thus the name. DC = Direct Current. Things like computers need DC (they use a AC to DC converter inside the power supply to convert it) Hope that helps a bit.
A "Rectifier" converts AC current to pulsating DC current.
A Rectifier converts Alternating current into Direct current
AC means alternating current DC means direct current there is no polarity reversal