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UNINTERRUPTIBLE POWER SUPPLY  An uninterruptible power supply (UPS) is a device that allows your computer to keep running for at least a short time when the primary power source is lost.  It also provides protection from power surges. A UPS contains a battery that "kicks in" when the device senses a loss of power from the primary source.  If you are using the computer when the UPS notifies you of the power loss, you have time to save any data you are working on and exit gracefully before the secondary power source (the battery) runs out.  When all power runs out, any data in your computer's random access memory (RAM) is erased.  When power surges occur, a UPS intercepts the surge so that it doesn't damage your computer. UNINTERRUPTIBLE POWER SUPPLY  An Uninterruptible Power Supply (UPS) contains an internal rechargeable battery that gets charged from the powerline then gets used to generate line power to the load when the powerlin

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What is computer ?                It is Common Operated Machine Prepared to use for Trade Education and Research   It is also called a Programmable Machine   It is fully Electronical Machine and Digital  History             In its most basic form a computer is any device which aids humans in performing various kinds of computations or calculations.  In that respect the earliest computer was the abacus, used to perform basic arithmetic operations. Every computer supports some form of input, processing, and output. This is less obvious on a primitive device such as the abacus where input, output and processing are simply the act of moving the pebbles into new positions, seeing the changed positions, and counting. Regardless, this is what computing is all about, in a nutshell. We input information, the computer processes it according to its basic logic or the program currently running, and outputs the results. Modern computers do this electronically, which enables them to p

introduction operating system  An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is a vital component of the system software in a computer system Application programs usually require an operating system to function. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware Examples of popular modern operating systems include Android, BSD, iOS, Linux, Mac OS X, Microsoft Windows,[3] Windows Phone, and IBM z/OS. All these, except Windows and z/OS, share roots in UNIX. This is the interface between the user of a computer system and the hardware. A basic functional definition is that it is a program that makes the computing power available to users by controlling the hardware operating syste m device management It deals with the devices such as motherboa