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How Does a UPS System Work?

Answer

A UPS is a protective device that protects a computer against voltage surges and spikes, voltage sags, total power failure and frequency differences. A standby UPS runs the computer on normal utility power until it detects a problem. At that point, it very quickly turns on a power inverter and runs the computer off of the UPS's battery.
3 Additional Answers
A UPS system works just like a big rechargeable battery. There is a battery in the UPS that stays charged while the UPS is plugged in. Once it looses power it goes to battery power. You can find more information at en.wikipedia.org
A UPS is used to protect a computer against power issues such as surges, sags, power failure and frequency differences. The UPS will monitor the electrical flow and if any of these issues arise it will resort to running the equipment off its battery supply to protect the it from damages.
There are two common systems in use today, standby UPS and continuous UPS. UPS is known as Uninterrupted Power Supply. A standby UPS runs the computer off the normal utility power until it detects a problem, Then it very quickly turns on a power inverter and runs the computer off the UPS battery. In a continuous UPS, the computer is always running off of the power from the battery,which is continuously being recharged.
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