2.Computer part & component2.1 Overview of the computer system
Learning Outcome• Identify main components in the computer system : – Monitor – Keyboard – Speaker – Mouse – System unit – Printer• State the functions of the main components in the computer system
MONITOR•computer display that is like a TV monitor•computer monitor image is made up of pixels (dots)Standard Liquid Crystaltelevision set Display (LCD)An ordinary These screenshome television are made up ofthat can be two glassused for Standard plates withcomputer computer liquid inoutput monitor between Better resolution than TV monitors
KEYBOARD MULTIMEDIA KEYBOARD WIRELESS KEYBOARD •The keyboard is the main input device for text and commands. •The computer keyboard uses the same key arrangement as typewriters. •It also contain standard function keys, such as the escape, cursor movement and control keys.
•Keyboards come with three (3) different types of portsuch as: SERIAL PORT PS/2 PORT USB PORT
SPEAKER•Speakers give out information in the form of sound.•Computer speakers range widely in quality and price.•Computer speakers are typically packaged with computer systems in small plastic boxes with mediocre sound quality.SYSTEM UNIT•also known as a base unit•the main body of a desktop computer
MOUSE•an input device used to controls the movement of the cursor or pointer on a display screen•It has right click, left click and double click to function
PRINTER•device that produces a hard copy (permanent humanreadable text or graphics) of documents stored in electronicform that prints texts or illustrations on paper Dot-Matrix printer Ink-Jet printer Laser printer low-cost printer that low-cost printer that uses a laser beam produces low quality produces a mid- to produce the output quality output best quality output works like an automatic most economical for speed of a laser typewriter color output printer is typically about can also be used when 8 ppm (page per carbon copies of a minute). document are required