A device (UPS: Uninterruptible Power Supply) that uses an internal battery to maintain power to connected equipment when the main power supply fails or experiences a momentary voltage drop. It is used to prevent data loss and system failures caused by sudden power outages. Its primary purpose is to provide enough time for a safe, orderly system shutdown during a power failure.

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• 2011h23a #43無停電電源装置の利用方法に関する説明のうち，適切なものはどれか。