Parts of a Computer

ByNatthanitcha Inthasen

P.6/5 No. 21

Hardware: Refers to the physical components of a

computer

Central

Processing Unit

Memory Unit

Other Device

Input Unit

Output Unit

VARIOUS HARDWARE COMPONENTS

Input Devices

Keyboard – keystrokes into electrical signals

Mouse – Movements of a mouse are displayed on the screen

Output Devices

Printer – take text and pictures to print them on paper

Speakers – produce sounds

Output Devices

Light pen – a light sensitive detector at its tip

Scanner – creates a picture file

Central Processing Unit (CPU)

Control Unit Arithmetic and Logic Unit

The brain of the computer

Memory

• capability to store huge amount of data• Expressed in terms of bytes

1024 bytes = 1 kilobyte (KB) 1024 KB = 1 megabyte (MB) 1024MB = 1 gigabyte (GB) 1024 GB = 1 terabyte (TB)

Primary / Secondary memory

• Primary - processor for storing data temporarily - Random Access Memory (RAM)• Secondary - information for longer period of time - Read Only Memory (ROM)

Uninterrupted Power Supply (UPS)

• prevents sudden power fluctuations and failures battery contained in it

• provide power backup for 15 minutes to 1 hour

Laptops and Tablets• Laptop - LCD monitor

- Keyboard - Touchpad / Trackball

• Tablet PC - thin notebook shapes with

touch screen - smaller,lighter than laptops

Software

• System software - DOS , Windows7 , UNIX.

• Application software - Microsoft Office - Windows Media Player