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In 1887 direct current (DC) was king. At that time there were 121 Edison power stations scattered across the United States delivering DC electricity to its customers. But DC had a great limitation -- namely, that power plants could only send DC electricity about a mile before the electricity began to lose power. So when George Westinghouse introduced his system based on high-voltage alternating current (AC), which could carry electricity hundreds of miles with little loss of power, people naturally took notice. A "battle of the currents" ensued. In the end, Westinghouse's AC prevailed.But this special feature isn't about the two electrical systems and how they worked. Rather, it's a simple explanation that shows the difference between AC and DC. 
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...it's full form is Alternate Current.
...it can be transmitted to long distances.
..it is generally of 220 Volts or more...
...it don't have +ve and -ve ions...
...it is generated by AC generators which work on diesel etc.

...DC stands for direct current..
...it can't be transmitted to long distances.
...it is of 12 Volts.
...it do have positive-negative ions.
...it is generated by DC generators..
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