Why do we use AC instead of DC?

Answer

AC which stands for Alternating Current is a type of electricity commonly used in homes and it alternates its direction in a back-and-forth motion. DC, which is Direct Current is electricity that flows in one direction through a wire. AC is mainly used because it is readily changed to higher or lower voltage levels, while it is difficult to do that with DC voltages. It is also easier to convert from AC to DC than the other way around.
Q&A Related to "Why do we use AC instead of DC?"
Ac is portable. AC can be stepped up and down with transformers for transmission over long distances.
http://wiki.answers.com/Q/Why_do_you_use_AC_instea...
AC is used for power wiring because a long power transmission wire loses more power if the current is greater. So a high voltage is used for power transmission to reduce the current
http://en.allexperts.com/q/Electrical-Engineering-...
it's possible to transport AC hundreds of miles. DC cannot be transported very far. if we were to use DC, we'd have to have power plants every few miles. there are many applications
http://answers.yahoo.com/question/index?qid=200901...
The largest losses in long distance electrical power transmission come from energy lost in the resistance of the power line. If P is the power transmitted, and R is the resistance
http://www.quora.com/When-and-why-is-DC-used-inste...
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