week 3

SYSTEM UNIT
system unit is a case that contains electronic components such as processor, memory, expansion cards, etc.

System unit have 4 components:
1. Processor
Processor is the most important part of computer. it processes a data and controls the computer.

2. Memory module
3. Expansion cards
- sound cards
- modem card
- video card
- network interface card
4. ports and connectors.
THE CPU

1. converts data into information
2. control center
3. set electronic circuitry the executes stored program instructions
4. two parts
- control unit (CU)
- arithmetic logic unit (ALU)


MAIN MEMORY

There are two types of memory:
1. RAM (random access memory)
the data that is being used by the processor, it looses its contents when power is turned off.

2. ROM (read only memory)
settings required to set up the computer, it doesn't looses its contents when power is turned off