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1. It regulates power from an unstable power source to the required clean stable voltage.
2. It prevents power surges and brownouts that might destroy the computer.
3. It temporarily provides power to the computer in case of the main power failure. This allows the user to save his/her work and shutdown the computer using the correct procedure.
4. Alerts the user of any power loss (by beeping).
Kavungya answered the question on April 2, 2019 at 12:00
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