this ppt is about different devices of computer

2. 1.The Keyboard
2.The Mouse
3.Joystick
4.The Scanner
5.Optical character reader (ocr)
6.Magnetic ink character reader (micr)
7.Light pen
8.Bar code reader
9.Microphone (mic)
10.Digital camera (digicam)

3. Advantages*
*reliable way of inputting text and numbers.
*available in variety of formats.
Disadvantages*
*not useful for entering some specific type of data (e.g..
pictures, diagrams, voice, video etc.
*very slow while

4. Advantages
*Ideal for pointing objectoptions on desktop computer
*Most familiar and easy to use pointing device.
Disadvantages
*need a f lat space close to computer.
*a mouse can’t easily be used with a laptop or a note book or a
palm top computer.

5. Advantages
*Easy to learn and use.
*not costly.
Disadvantages
*movement is offered only in forward, backward left and right
directions , so diagonal movements create problems at times.

6. Advantages
*It can copy things onto computers then you can alter the things
you copied.
*they are useful for capturing images and being stored in a
computer
Disadvantages
*images can take a lot of memory space
*scanners are not portable devices

7. Advantages
*It can be stored on a computer so is less likely to be lost.
*converted text is editable in word processors.
Disadvantages
*you need to buy a scanner and OCR software
*It is not completely accurate and text would need proof -
reading afterwards

8. Advantages
*Documents prepared for MICR are difficult to forge
*Documents can still be read after being folded or split etc.
Disadvantages
*MICR readers and encoders are expensive
*The system can only accept a few characters.

9. Advantages
*Easy to use
*Can directly draw on screen
Disadvantages
*Not very accurate while drawing
*Tiresome after long usage hours

10. Advantages
*Fast and reliable method of inputting data
*can even read from curved or upside down surfaces
Disadvantages
*Input is limited to a number code