Stupid Question?

Microsoft Windows XP

Is a power sytem in your PC the same as a UPS? I am having a PC built
That's not a stupid question. Humorous, to be sure, but not stupid.

The computer's power supply transforms the voltage from the wall socket into
the voltages your computer needs. The UPS (uninterruptable power supply) is
essentially a battery that will continue to supply power to your computer
during a blackout. You need both.

The power supply is built into the computer. The UPS is separate from the
computer.

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