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An '''Uninterruptible Power Supply''' (UPS) is an electronic device which takes in and puts out "Street Power" ([[Electricity]]) from the [[power grid]], and remains generally dormant.  When power from the grid becomes weak (brown-out), spikes, differs in frequency or becomes unavailable, the UPS immediately starts supplying power from it's reserve, so the attached devices continue to receive a steady flow of [[current]].  A UPS will often have nothing more than a rechargeable battery, which will supply [[DC power]] to a [[transformer]] which converts it into (synthetic) [[AC power]], which is then fed to the dependent device(s).  This kind of UPS will often be smaller than a desktop computer, although they can be much larger.  Larger, High-drain UPS devices will sometimes have a [[backup generator]] which will be started using the power from a small battery.  That battery will also generally supply power (through a [[transformer]]) to the dependent devices while the generator starts up.  Once the generator is running, it alone will supply pure [[AC power]] until the UPS detects stable power from the the main supply, the [[power grid]].  At this time it will switch over power to that main source, and power down the generator. <ref>"How Does a Computers Uninterruptible Power Supply Work?" How Stuff Works. Web. 4 Dec. 2015. <http://computer.howstuffworks.com/question28.htm>.</ref>

An '''Uninterruptible Power Supply''' (UPS) is an electronic device which takes in and puts out "Street Power" ([[Electricity]]) from the [[power grid]], and remains generally dormant.  When power from the grid becomes weak (brown-out), spikes, differs in frequency or becomes unavailable, the UPS immediately starts supplying power from it's reserve, so the attached devices continue to receive a steady flow of [[current]].  A UPS will often have nothing more than a rechargeable battery, which will supply [[Direct current|DC power]] to a [[transformer]] which converts it into (synthetic) [[Alternating Current (AC)|AC Power]], which is then fed to the dependent device(s).  This kind of UPS will often be smaller than a desktop computer, although they can be much larger.  Larger, High-drain UPS devices will sometimes have a [[backup generator]] which will be started using the power from a small battery.  That battery will also generally supply power (through a [[transformer]]) to the dependent devices while the generator starts up.  Once the generator is running, it alone will supply pure [[Alternating Current (AC)|AC Power]] until the UPS detects stable power from the the main supply, the [[power grid]].  At this time it will switch over power to that main source, and power down the generator. <ref>"How Does a Computers Uninterruptible Power Supply Work?" How Stuff Works. Web. 4 Dec. 2015. <http://computer.howstuffworks.com/question28.htm>.</ref>

    

    

== External Links ==

== External Links ==

http://www.tech-faq.com/how-an-uninterruptible-power-supply-works.html

http://www.tech-faq.com/how-an-uninterruptible-power-supply-works.html