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  • Level: GCSE
  • Subject: ICT
  • Word count: 1872

ICT Hardware Guide

Extracts from this document...


Users Guide Users Guide 1 Introduction 2 General Purpose System 3 Input devices 3 Keyboard 3 Mouse 3 Scanner 3 Output devices 3 Monitors 3 Printers 3 Processor 3 Storage devices 3 Hard drive 3 Floppy drive 3 CD-ROM 3 Memory 3 ROM 3 RAM 3 Appendix 3 Introduction I wrote this user guide to introduce parts of a computer system and what each part does when we use the. This user guide offers a very basic knowledge of hardware components aimed primarily at people who don't know much about computers. General Purpose System The computer system we use and see around ourselves is made up of different components (hardware), which are put together to form an ICT system. The component we using varies according to our needs. For example the hardware components used by a car designer is different from a student who use a computer to do his college work. Computer hardware components can be categorized as following: * Input devices * Output devices * Processors * Storage devices * Memory Input devices Input devices are used to input data into a computer system before the data is turned into useful information. The most commonly used input devices are: * Keyboard * Mouse * Scanner Keyboard Keyboard is the most important and commonly used input device. A keyboard consist of following four areas: 1. ...read more.


Widely used output devices are: * Monitors * Printers Monitors Monitor is the most important output device. Monitor displays image, character like as we see things on a TV screen. A monitor is sometimes called a CRT (Cathode Ray Tube). A monitor produces a soft copy with means that when we turn the computer off we will lose everything, which was on screen. Monitors come in different sized 15, 17, 19 and 21 inches. The distance between the two corners of its screen determines the size of a monitor. The quality of the picture on a monitor can be determined by its resolution. Resolution is measured in pixels (picture elements). One pixel is the smallest unit that can be displayed on the screen. The more the number of pixels the higher the resolution and the better the quality of the picture. The picture on screen should be refreshed otherwise it will fade ad disappears. The picture must be regenerated which is known as refresh rate. The re refresh rate of a monitor is measured in MHz (millions of cycles per seconds). Most monitors now have refresh rate of 70, 75 or 85 MHz. The higher the refresh rate the less the image flickers. Printers Printer is an output device, which provides a hard copy of what is on the screen. Tow types of printers are most in use today inkjet and laser printer. ...read more.


To protect the data stored on a floppy disk we should always keep floppy disks away from dust, extreme temperature, moisture and should not be stored near magnetic fields (telephone, television). CD-ROM CD-ROM (Compact Disk Read Only Memory) is a storage device. A CD-ROM uses laser beam to read the data from the optical disc. A CD holds up to 650 MB of data, which is equivalent to about 450 floppy disks. CD Re-writer is available which enable us to store data on a CD. Now we can make copies of music on a CD. CD Re-writers are widely used for backing up hard drive. Memory Memory is a chip inside the main processing unit, which is used to store data and programs permanently or temporarily for fast access. There are two types of memory: * ROM * RAM ROM ROM (Read Only Memory) is a permanent memory. The program stored in ROM is always available whether the computer is on or off. Boot program is stored in the ROM when computer is manufactured we can read the data cannot be changed. RAM RAM (Random Access Memory) is another type of memory it is also called a volatile of temporary memory because it stores programs and data when computer is running but when we turn off the computer all programs and files are lost. We must make sure we save all our files we have created before turning the computer off. The capacity of RAM is measured in MB (megabyte). Today computers are available with 128, 256 and 512 MB of RAM. ...read more.

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