Components of the Computer System Unit
Components of the System Unit
- Internal Power Supply (SMPS)
- Exhaust Fan
- Speaker
- Motherboard
- Storage Systems
- Microprocessor
Storage Device/Media
- Data needs to be stored for later use on storage media.
- The two types of storage media are:
- Primary storage media
- Secondary storage media
Primary storage media
- It is the internal storage area of the machine.
- Random Access Memory (RAM)
- This is the memory that the computer uses for storing the programs
and their data while working on them.
- RAM has the following characteristics:
- Data within the RAM can be read or modified, i.e. you can either
read from the RAM or write onto it. Hence it is called read/write
memory
Secondary storage media
- Compact Disk (CD ROM)
- Floppy Disk
- Cartridge Tape
- Magneto-Optical Disk
- USB drive / Pen Drive
- Memory Stick
- Hard Disk
SMPS (Switch Mode Power Supply)
- The system draws power from AC mains through a power protection
device.
- This power is not directly supplied to the internal components , instead
one of the components called Internal Power Supply.
- Otherwise known as Switched Mode Power Supply.
- It can convert the AC input into DC output of 5 & 12 volts.
Exhaust Fan
- The SMPS has a small fan, called exhaust fan, attached to it.
- It can rotate as long as the system switched on.
- Main function is – cool the SMPS Unit
Speaker
- The system unit has also a small audio speaker attached to it.
- It is connected with the Motherboard.
It can create a beep sound to indicate everything is working satisfactory.
- Also used to entertainment programs to produced sound effects.
Motherboard
- When you open the system unit, a large board containing a number of tiny
electronic circuits called Motherboard.
- All PC peripheral devices are connected with the Motherboard.
Microprocessor
- The microprocessor consists of ALU Unit, Control Unit, Memory unit
- It can move data from one memory location to another
- The capacity of Microprocessor is measured in the term of the number of
bits it can send or receive & the number of bits it can process internally.
- Ex – 8088 --- 8 / 16 bit processor
- 80286 – 16 / 16 bit processor
- Manufacture company – Intel , Motorola
- Pentium is a 32 bit processor
- Pentium IV is a 32 bit processor with 64 data path.