The Computer is a Device Used to Work With Information

The computer
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  Reading 1. The computer is a device used to work with information’s.  It has 2 parts: 1. Hardware 2. Software The hardware is the physical part of the computer, it has four parts: 1. Monitor, Mouse, Keyboard, cpu. Any component added to the computer is called peripheral components, example: Scanner, Fax and Printers. The monitor is the standard devic e used to display information’s from the computer. The types of monitor are: Monochrome, Polychrome, Crt, Rgb, Ega, Vga, S vga, LCD and touch. The keyboard: Is the standard device used to enter information to the computer. It has five parts: Functions keys  Arrow keys Special Keys  Alphanumeric keys The mouse is a device used to move and enter information to the computer.  Reading 2 The cpu is the brain of the computer and it is a groups of component connected together from the central processing unit (Cpu) The part of the cpu are: the case, the power supply, the bios, the modem, the usb parts, the fan cooler, the mother board, the sound card, the video card, the expiation slot, the memory, the battery, the processor, the transmition cable, the hard disk, the burner, the cd room, and soon. The software is the logical part of the computer. There are two types of software. 1) Operating System 2) Application The operating control and manages all the resources of hardware and application of the computer. There are two parts of operating system. 1) Based on commands 2) Based on windows  Reading 3  A network is the connection of two or more components to share resources and information. Any point where the information goes in and goes out s called network node. The computers that provide resources and information to other computers is a network are called network servers, the network clients are the computers that use those resources. The type of network are: PAN, LAN, MAN, WAN and GAN network, the network topology is the physical setting of the network. There are Ring, Bus and Star topology. The network protocols are the rules and procedures for the computers to shared resource and information. The means of transportation of information in a network are: microwaves, optic fiber, coax cable, UTP and STP cable. In a network there are network communication device like host repeater, bridge, switch router and waterway.  A soft terminal is formed by a keyboard and a monitor and it doesn’t have CPU.  To end, the father of internet is Vinton Cerf. Keyboard parts Alphanumeric The alphanumeric part of the keyboard shows the letters, numbers, punctuation and a few symbols such as percent and dollar sign. The standard U.S. keyboard shows only Western, English characters, but the ASCII Code that is the basis for keyboards can type 256 characters, including accented and special characters from European languages. You can type these on your U.S. keyboard by holding down the Alt key and typing the ASCII number of the character, available from an ASCII reference such as The ASCII Code. You can type all 256 characters this way. Function Keys You can find the twelve function keys across the top of the keyboard. The functions they carry out depend mainly on the computer and software that you are using, but there are some standard functions. F1 usually opens a help file. F2 lets you edit a selection, for example a cell in MS Excel. F3 opens Find. F4 repeats an action such as bolding text. F5 gives a refresh command. The other keys often have specific functions, depending on the program that is open. Some computers also use them to control screen brightness and sound volume.  Control Keys The two control keys, Ctrl and Alt, are at the bottom left and bottom right of the alphanumeric part of the keyboard. They are designed to be held down in conjunction with other keys to accomplish specific functions. Particularly useful is Ctrl plus C to copy a selected text to the clipboard and Ctrl plus V to paste it. Ctrl plus B, I, or U bolds, italicizes or underlines selected text. Alt plus F4 closes the current program window. Alt plus underlined letters in Windows menus carries out the corresponding functions. Navigation Keys The navigation keys are the arrow keys and others to the left of the numeric keypad. They work as expected except for the Insert key which toggles between insert and overwrite in word processors. If your word processor suddenly starts overwriting text when you want to insert it, press the Insert key to toggle back. Above the navigation keys are legacy keys that are rarely used. Print Screen copies an image of the screen to the clipboard from where you can paste it into a graphics program like Paint to obtain a screen capture image. Numeric Keypad The numeric keypad to the right of the keyboard allows you to enter numbers quickly with one hand. Basic arithmetic functions are there as well. The Num Lock function must be selected, as usually indicated by a Num Lock LED that lights up. If NUM Lock is not selected, the numeric keypad acts as a duplicate to the navigation keys, rather than outputting numbers. The numeric keypad works with the Windows calculator, found in the Start menu under Accessories. It displays a calculator on the screen with numeric keys in the same arrangement as the keypad.  A computer monitor, technically termed as a visual display unit, can be plainly described as an electronic device that transmits information from the computer onto a screen, thereby acting as an interface and connecting the viewer with the computer. At present, computer monitors are available in a variety of shapes, designs, and colors. However, based on the technology used to make computer monitors, they can be broadly categorized into three types. 1. CRT (Cathode Ray Tube) 2. LCD (Liquid Crystal Display) 3. LED (Light-Emitting Diodes)
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