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ups refers to uninterruped power suplly

it consists of a battery it gets charge when main power is on then supplys power when main supply gets off .

inside inverter circuit will conver(batteryacts as source) dc to 220 volts ac hence PC runs even when main poweresupply is off

the are 2 types of ups are available

1.ofline mode

2.online mode

in ofline mode battery gets charge while main powr is on then delivers powr when main supply is off

in online mode charging and discharging battery at same time when main power is off it will just gets disconnected of charging path

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