The main
reason for preferring use of ac voltage over dc voltage is that ac voltages
can be easily and efficiently converted from one voltage to the other by
means of transformers Further, electrical energy can also be transmitted
economically over long distances AC circuits exhibit characteristics which
are exploited in many devices of daily use For example, whenever we
tune our radio to a favourite station, we are taking advantage of a special
property of ac circuits – one of many that you will study in this chapter