Answer / vijay

when you connect a supply of 220 V AC/DC to a battery of 20 V DC the first thing that there would a big flash and battery will blast, if the 220 V side as reliable fuse / breaker it will trip. Now if it is AC then the effect would be more severe because the electro chemistry of the battery is subjected to reversal at a very fast rate.

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In DC while we mention the voltage we are using -48V but in case of AC we mention only 230V not -230V, why we using -48V not 48V

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