| A | B |
|---|
| Input Output System | the memory which tells the computer what to do when it srarts up |
| Bit | the smallest unit of data possible in a computer, a one or a zero |
| Cards | carry out any extra tasks not built in to the main board |
| CD ROM Drive | stands for Compact Disc Read-Only memory Drive |
| Cooling Fan | cools the central processing unit, the CPU |
| CPU | sometimes called the microprocessor; carries millions of electrical signals each second |
| Hard Disk Drive | where programs and files are saved permanently |
| Hard Disk | stores zeros and ones in magnetic form and reads them with an electromagnetic head |
| Hertz | a cycle, or clock tick, per second |
| Main Board or Motherboard | is home to a lot of the important components in a computer; is the brain of the computer |
| Output Devices | communicate back to the user, what is being processed |
| Pixel | one dot on the screen which is lit up by electrons hitting a glass screen coated with a chemical called phorphorus |
| Power Supply | provides power, at the right the voltage, to all of the different parts of the computer |
| RAM | Random Access Memory; computer uses RAM to store instructions and data while it is running |
| Transistors | a tiny circuit board with millions of switches; located inside the CPU chip |
