Question

state one main difference between ac and dc. why ac is preferred over dc for long range transmission of electric power . name one source each of dc and ac

Answer 1

AC current flows in both direction whereas DC current flows in only one direction AC current is preferred over DC for long hairs transmission because AC current AC current has less loss of energy .
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Answer 2

Mostly alternate current is preferred always over direct current. This is only because it remains super easy to maintain as well as to change the voltage for AC electricity for transmitting and distributing.

Most of the plants uses AC and thus the same is produced better to be used AC than DC. This is thus most of the times, Alternate current is preferred always.