| A | B |
|---|
| peripheral | when added to computer, it enhances its functionality |
| system unit | holds the main computer components |
| access time | time it takes computer to locate data in a storage medium |
| bios | basic input ouput system |
| data bus | how data travels from one component to another |
| expansion bus | part of the data bus to which peripheral devices connect to |
| expansion card | small circuit board that allows computer ability to control a device |
| expansion slot | socket in the system board to plug expansion card |
| gigahertz | a billion cycles per second |
| megahertz | one million cycles per second |
| ram | random access memory |
| rom | read only memory |
| storage medium | substance that contains data |
| storage device | records and retrieves data from storage medium |
| storage density | amount of data that can be stored |
| virtual memory | area of hard disk used to store parts of programs or data files until needed |
| volatile | requires electricity to hold data |
| word size | number of bits a processor can manipulate at a time |
