Title: AC/DC

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Q: Besides being a rock band [...] describes two different kinds of [...]. In [...] current or short AC circuits the current moves back and forth several times per second, while in [...] current or short DC circuits the current only moves in one direction. For electrical power transmission mainly [...] current is used while cell phones, computers and LED lighting need [...] current.
A: AC/DC; electrical currents; alternating; direct; AC; DC