System Unit
SIMMS – Single Inline memory Modules. SIMMs are electronic modules about 10-1/2 centimeters long that sit in slots, usually located on the main system board.
Video Adapter – also called Video Card. This is the interface card installed in the computer that controls and produces video on the monitor.
Motherboard – the main electronic circuit in a PC.
Power Supply - a case that holds a transformer, voltage control, and (usually) a cooling fan
Sound Board – also called Sound Card. Ttranslates signals from the system board into analog voltage levels, and has terminals to plug in speakers.
CD-Rom Drive - the most common type of removable media, cheap but fragile.