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