CHAPTR 3 HARDWARE DEVICES.ppt FOR Y9 STUDENTSx

Y9

1. STRAND 2: COMPUTER CONCEPTS AND SKILLS

2. USING APPLICATION SOFTWARE A Computer is an electronic device that accepts input data, processes data, stores data and produces output into useful information. Data is a collection of raw unprocessed facts, figures and symbols. Computers process data to create information . Information is data that is organized, meaningful, and useful.

3. Components Of A Computer System Flow of information:

4. HARDWARE DEVICES Hardware refers to the physical equipment, which makes up a computer system such as monitor, keyboard, processor, printer etc. Hardware works under the control of software.

5. Monitor An output device. Is a display unit that is used to show data that has been put in a computer

6. Printer An output device Gives result on paper

7. Speaker An output device Produce audio output(sound)

8. Mouse is an input device used to point and click on icons, menus, command buttons on a computer's Graphical user interface. It is also used to navigate the cursor and select whatever you desire.

9. Keyboard An input device. is the set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys. The keys on computer keyboards are often classified as follows: *alphanumeric keys -- letters and numbers *punctuation keys -- comma, period, semicolon, and so on. *special keys -- function keys, control keys, arrow keys, Caps Lock key, and so on.

10. The System Unit Processing device The main part, processing unit and devices, of a microcomputer is a system unit. A system unit, also known as the system cabinet or chassis , includes a board called a motherboard that holds a microprocessor chip (or a CPU), memory chips, and expansion slots.

11. Joystick is an input device. consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.

12. A barcode reader(or barcode scanner) It is an input device. is an electronic device for reading printed barcode