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Short Essay on Computer
ali_jatt63@hotmail.com
Introduction:-
Computer is an electronic device which can take input from the user and process this input data and if need, store data or information on storage devices and give output on outputdevices. It follow the instructions us it is which we input. It takes input through Keyboard, mouse, etc and then it processes the input data and give output on display screen and store data if need.
Desktop Computer:-
Mostly called personal computer (PC), design to fit completely on a typical desk of office or home. It mainly comes with a monitor, a minitower or horizontal casing. Today, mostly
Casingcontains processor, hard disk in gigabytes, built-in modem, LAN port, USB ports and CD-ROM. Over the past few years. CPU processing speed has been increasing processing speed can be increase by adding capable RAM, capable BUS, high processor which have high processing cycle, hence more heat is also produced we use heat sinks and fans for the removal of heat from the computer as higher temperaturecan cause severe damage to the computer, fans are noisy and aren’t much effective so the new trend is liquid cooling. It’s just like a radiator installed for cooling, a liquid is circulated in the heat sink attached to the processor heat is transferred from the processor to the liquid is then transferred to the radiator the liquid is cooled down there and then again circulated to the heat sink.It’s less noisy as compared to fan as high speed processor clocked at higher speed need fan rpm over 7500. This new trend is helpful for the people who want to over clock their processors. Over clocking means to gain higher speed from the same processor, or running the processor at extreme level in which cooling come as very important factor.
Laptop Computer:-
Laptop is a portable computer which canbe easily used on lap. Small enough to fit in briefcase mostly called “notebook”. It can run directly by electric source or on batteries. Most of laptop weighs less than five pounds and are less than three inches thick.  Laptop mostly cost more than desktop computers with same specifications, because they are difficult to build than desktop computer.
It contains almost things which are in desktopbut have built-in LCD, keyboard and mouse. New technology which is introduced in laptop is PROCESSOR: Core i7-2600K Quad Core, DDR3 SDRAM with a memory clock frequency of 100 MHz gives a maximum rate of transfer of 6400 MB per second. Now introduce DDR4, SDRAM.  HARD DISK: Seagate Barracuda 1.50TB internal hard drive. BATTERY: Micromanagement miraculous battery 12-hours timing, GAMING GRAPHICES:NVIDIA before GTX 400m series. Another new trend is of gaming laptops let’s take an example of the new alien ware m11x the most powerful 11inch desktop with 1gb NVIDIA 335M graphics, with 7 hours of battery time with Nvidia Optimus graphics switching technology, DDR3 ram.
Advantages:
There are many advantages of laptop and some are it is in light weight and is portable, can be used while traveling,in home or in office. It run on batteries and that’s why it can be used anywhere, anytime depending on batteries. There is no need of external keyboard, mouse or displaying screen.
Disadvantages:
They are hardly difficult to repair and are more expensive as compare to desktop. If there is any problem in CPU or in graphics then they can’t be repaired by normal technician.
Palmtop Computer:
A smallcomputer which mostly fit in your palm as compared to notebook or desktop computers. It has limited features, but famous for certain things like phonebook, calendars, etc. It is used by a pen rather than a keyboard or mouse as an input, and mostly called PDA or hand-held computers.  Due to small size they don’t have disk drives but instead palmtop includes PCMCIA slots through which you can...