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AC is alternating current. DC is direct current. They both have advantages and dissadvantages. DC has brushes and a commutator. AC has slip rings. DC is much easier to control therefore cheaper. AC will take abuse more and is more powerfull but to control it is more difficult. Therefore more expensive because of the circuitry and computers used to control the current. There are more issues with both. The history of DC versus AC is quite interesting especially when it comes to your home.
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