Historically, dc sources were the main means of providing electric power up until late 1800's. at the end of the century, the battle between direct current and alternating current began.
Nicolas Tesla and George Westinghouse
helped establish alternating current as the primary mode of electricity transmission and distribution.
AC systems is more efficient and more economical to transmit over long distances. To begin the analysis of AC systems, we should begin about to learn about SINUSOIDS AND PHASORS.
A SINUSOID is a signal that has the form of sine or cosine function. IT is usually referred to as alternating current.
http://web.cecs.pdx.edu/~prasads/Phasors.pdf
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