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Question:

why we need transfer ac current in dc?

why don't government supply pure D.Ccurrent in our house?

Answer:

That is the way I would do them for my lunchThe secret is not to use moist soggy fillingTry things like a slice of silver-side and mustardMashed eggs also make a good sandwichLettuceIf you wnt to have a tomato sandwich, butter your bread but take whole tomatoes, a sharp knife and S P.
Make sure the airs out of the food bag,then put them on top of the cooler packs
I put each one in it's on Ziplock baggy, but then I take all sandwiches and put them in a Glade Ware plastic tub - you know the ones that have the lidsThen, make sure to put them on the top of the cooler so they don't get in where they can take in water from the melting ice cubes in the ice chest and soak the sandwichesGood luck.
Alternating Current is safer and less expensive to generateDirect current in a house can be very dangerous and deadlyI work on elevators for a living and work with high voltage DC all the timeBelieve me, you don't want that in your houseI watched a mechanic cut a set of wires that were 440VDCBlew him straight across the room and broke his armIf you cut 120/220 VAC in your house you'll just get a loud bang and a sparkPlus nothing in a household requires a constant current like DC.

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