CPU (Central Processing Unit) / Processor
interpret and carries out basic instructions to operate a computer
2 component in processor
- control unit - directs and coordinate most of the operations
- ALU (arithmetic logic unit) - perform arithmetic, comparisons and other operations
machine cycle
- Fetching - CU obtain data and instruction from memory
- Decoding - CU decode instruction into signal that can be execute to ALU
- Executing - ALU carry out the instruction
- Storing - result store in memory
System clock
control the timing of computer operations
Clock speed
- pace
- gigahertz (GHz)
4 cooling method
- heat sink
- fan
- cooling liquid technologies
- cooling pad
advantages of cloud computing
- accessibility
- space saving
- cost saving
- scalability
2 types of signal in data representation
- analog - continuous and vary in strength and quality
- digital - on and off
3 categories of item stored in memory
- data being processed and resulting information
- applications
- operating system and programs
2 types of memory
- Volatile - content loss when power is removed (RAM)
- Non-volatile - content remain when power is removed (ROM, Flash memory)
2 types of RAM
- dynamic
- static
function of memory cache
speed processing time by storing frequently used data and instructions
flash memory
can be erase electronically and rewritten
- CMOS technology use battery power to retain information
Define access time
time taken by the processor to read from memory
- unit: nanoseconds
4 access time terms
- milli - one-thousandth of a second
- micro - million
- nano - billion
- pico - trillion
examples of adapter card
- MIDI
- bluetooth
- video card
- sound card
- USB
3 types of bus
- system
- backside
- expansion
define word size (bus)
number of bits can be interpret and execute by the processor at a given time
how bus works
bits travel on bus, from input device to the memory, following by processor memory and output device
ways to care of computer
- unplug to avoid overcharging
- run antivirus scanning regularly
- update operating system
- back up data
