The document summarizes the main internal components of a computer system. The system case contains the electrical, electronic, and mechanical parts of the computer. Key components include the power supply, storage devices like the hard drive and CD/DVD drive, the motherboard which holds the processor, memory, and input/output chips, the CPU or microprocessor, expansion slots for adding additional functionality, and ports and connectors for attaching external devices and storage.

2.  Contains the electrical,
electronic, and
mechanical parts of a
computer attached
within the system case.

4.  Power Supply – the
“lifeblood” of the
computer

7.  Storage Devices
 Hard Drive
 Floppy Drive
 CD/DVD-ROM Drive
 Memory card

8.  Motherboard – the
“heart” of the
computer
 It holds the:
▪ processor chip
▪ memory chips
▪ chips that handle
input/output (I/O)
▪ the expansion slots for
connecting peripherals

9.  CPU or Microprocessor – the “brain” of the
computer

10.  Chips

11.  Expansion slots – for
expansion cards

12. Network Interface Card (NIC) or LAN card
Video card
Sound card
 Expansion cards

14.  Port connects external devices to system
unit, like printer, speaker, headset, monitor,
etc. It is usually found at the back panel of
the system unit.
 Connector joins cable to devices like hard
drive, floppy drive, USB, audio, video, LAN,
etc. It is usually found inside the system
unit.