4. .

7. • One of the common and
widely used input device.
• The keyboard is divided into
different areas.
• The most common names
for keyboards is QWERTY.

8. Advantages :
• A keyboard is usually
supplied with computers
• People are used to using
keyboards to enter data.

9. Disadvantages:
• Mistakes are easily made
• Excessive use can lead to
R.S.I
• Keyboards are not suitable
for creating diagrams

10. • The mouse is also one of the
most common input devices used.
• Also known as the pointing
device.
• Enables you to control what
happens on the screen and what
to point at.

11. • Ideal for use with desktop
computers
• Users are familiar with the
mouse

12. • Overuse can lead to R.S.I.
• Is not accurate in drawings.
• Is not easy and convenient
to insert text.

16. Inkjet Laser
Quiet Speed ( moves more
quickly)
Fast Precision
Cheap Economy
Good quality Excellent quality

17. Inkjet Laser
Ink may be smudged Expensive
Good quality paper needed Cartridges are quite
expensive

18. display resolution

19. Advantages Disadvantages
Cheap CRT is abit
more dull than
LCD
Displays Consumes a lot
everything you of power
are doing
communication