This document defines and describes different types of computer hardware including monitors, printers, speakers, and projectors. It explains that monitors are used to observe and record information and lists CRT and LCD as common types. It also defines printers as devices that print on paper and lists laser, inkjet, and daisywheel as common printer types. Finally, it provides brief descriptions of how speakers and projectors function.

12. MONITOR
• Device used for observing, checking, or
keeping a continuous record of something.
TYPES OF MONITOR
CRTs (Cathode ray tube)
LCD (LIQUID CRYSTAL DISPLAY)

13. CATHODE RAY TUBE

14. LIQUID CRYSTAL DISPLAY

15. PRINTER
• A printer is any device that prints text or
illustrations on paper.
TYPES OF PRINTER
LASER PRINTER
INKJET PRINTER
DAISYWHEEL PRINTER

16. WORKING OF A PRINTER

17. SPEAKER
• A speaker is a term used to describe the user
who is giving vocal commands to a software
program.
WORKING OF A SPEAKER

18. PROJECTOR
Device that is used to project rays of light
especially an apparatus with a system of
lenses for projecting slides or film on to a
screen.

19. WORKING OF A PROJECTOR