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why ac supply is maximum used?why not DC?
About every 3-6 months, someone asks this same old question, which has been answered countless times in earlier threads.
make a table
AC : DC
Advantages / disadvantages
Check which outweighs what, under what applications/ conditions
Write a full report. Submit next friday.
PS: Negative marks will be allocated if found cheating (eg asking to seniors/ online forums/copying verbatim from books)
Short answer: distance.
Do research on that issue and you will see why.