Input and output devices

Input and output devices in computer

1. Introduction To Computing Presetation No: 1 Presented To: Prof Azhar Iqbal Presented By: Danyal Ahmad

2. Presentation Outline Input Input Devices Output Output Devices

3. What is Input? Instructions give to the computer for processing is called input.

4. Input Devices “An input device is a hardware component that alows the user to enter data or instructions in to the computer” The input devices are following: Keyboard Mouse Microphone Scanner Joystick Touch screen

5. Keyboard It is the typye of input device which is most commonly used.It consist of keys that is used to enter tha data in the computer.A simple keyboard typically has 105 keys.There are alphabet keys(A-Z),numerical(0-9),function keys(f1-f12),and special symbol keys. Uses of keyboard: For typing purpose For enter data or give instructions For playing games For operating different software

6. Mouse Mouse is a point and click input device with two or three buttons.It controls the point or cursor on the display screen. Uses of Mouse: For Playing games Scrolling the page Give command through click Types of Mouse: Mechanical Mouse Optical Mouse

7. Mechanical Mouse: A mechanical mouse has a rubber ball on its underside.which rolls in all direction.It contain a circuit to detect the movement. Optical Mouse: Optical mouse uses Laser to dectate the mouse movement.It responds more quickly.

8. Microphone It is also called a input device,which can be used to record sound into the computer system.Mic is specially used for voice chatting,recording and writing data into text documents.

9. Scanner It is also called a optical reader.It scans or read text and picturers on a paper and enter them directly into the computer system.Laser technology is used in the scanner.Once the picture or data is stored after scanning, It can sent anywhere and can perform any operation on it.

10. Joystick A joystick is a pointing device that works on the principle of trackball On most joysticks, a button on the top is provided to select the option currently pointed to by the cursor Commonly used for controlling player movements in video or computer games.

11. Touch Screen A touch screen is a touch sensitive display device.User interact with by touching areas of the screen with the finger.User give the command by touching the screen.Many ATMs have touch screens.Computers or notebook laptops also have touch screen display.

12. What is output? Output is a data that has been processed into a usefull information.

13. Output Devices “An output device is a hardware compnent that produces information for the user in the form of softcopy or hardcopy” The output devices are following: Monitor Speaker Printer

14. Monitor It is the most commonly used output device.It is like television screen,which can be used to watch all the activities we perform on computer. Types of Monitor: CRT (Cathode Ray Tube) Monitors Flat Panel Monitor

15. CRT (Cathode Ray Tube)Monitor: A CRT monitor is a desktop monitor thar is similer to a standard television because it contains a Cathode Ray Tube.A CRT is a large scaled glass tube.The front of the tube is screen.Tiny dots of phosphor meterial coat the screen on a CRT monitor. Flat Panel Monitors: They are much thinner,weightless and consume less power and space.Flat panel monitors are manufactured by using several technologies but LCD(Liquid Crystal Display)is coomon one.It produce sharp image.

16. Speakers An audio output device is a component of a computer that produces music or other sounds.Many users add speakers to their computers to generate high quality sound.When using speaker any one at nearby is listen the output but when using headset,only the individual wearing it can listen output.

17. Printer A printer is a haerdcopy output device that produces text and graphics on the paper.Different printers have different printing techniques. There are two types of printers: Impact Printer NON-Impact Printer

18. Impact Printer: An impact printer work just like typewriter.An impact printers creates characters on a paper by striking pins or hammer against an inked ribbon.Impact printer is noisy because of its striking activity. NON-Impact Printer: A non-impact printer forms character and graphics on a paper without striking the paper.Some spray ink,heat or pressure use to create a output.It can also uses LASER technology.They are much faster and quiter because they do not strike the paper.