1. UNIT3COMPUTERSYSTEMS
By Harry Eleftheriou
Internal computer components

2. Power Supply
• The power supply is important because it powers all
the other internal components. It is a step down
transformer it decreases 240volts to 12 volts. It powers
the motherboard and all the internal components via
the motherboard.

3. Mother Board
The mother board is what connects all the
internal components together. It is also where
all the external components connect EX USB and
VGA port.

4. CPU- Central processing Unit
• The CPU processes all the instructions of the operating
software to perform base arithmetical, logical and
input and output operations of the system. The CPU is
always working so it needs to be kept cool either a heat
sink. You can also keep the CPU cool by using a water
cooled system which will keep the CPU cooler than an
air cooled system.

5. Hard drive
• The hard drive is where all the data and computer
software and operating system is stored and all
personal files are also stored here, there are 3
types: sata and IDE and solid state. Solid state
means there are no moving parts within, they use
flash memory, this means if it was to be dropped
it would not go corrupt. The other two both have
moving parts within and if they where to be
dropped then they would most likely to be
damaged.

6. Optical Drive
• The optical drive is what is used to load
different types of software such as anti-virus
software ETC. There are several types here are
a few DVD R/RW which can read DVD and CD’s
and it can also write and rewrite to DVD and
CD’s.

7. RAM- Random Access Memory
• Memory is volatile, looses the information
after the power is cut. The more RAM the
more speed the computer will obtain.

8. Graphics Card
• Used to give a display access and can
sometimes render the image to a 3D image
ETC. Graphics cards can be used to upgrade
your graphics for example some cards have a
HDMI port so you can plug it into a HD
monitor and obtain better graphics.