Explore a computer

1. Scanner (nowadays this is in mobile itself, not very much used)
2. CPU – This is the processing unit
3. Main Memory: RAM: This determines how fast the computer works
4. Expansion cards
5. Power supply unit
6. CD Drive – External storage device
7. Hard disk: This determines how much storage capacity
8. Motherboard: This is where all instructions are wired together and helps the computer work
9. Speakers
10. Monitor
11. Operating System
12. Application Software
13. Keyboard
14. Mouse
15. External Hard Disk
16. Printer

Source: Wikimedia commons