| A | B |
|---|
| electicity | The use of electicity to control,communicate, and process information. |
| electonic signal | an electric current that varies in order to represent information |
| analog signal | an electric current that is varied smoothly to represent information |
| digital signal | an electirc current that uses pulses to represent information |
| semiconductor | a material that conducts current better than an insulator but not as well as a conductor |
| diode | an electronic part that has a n-type semiconductor joined together. |
| transistor | an electronic part that has one type of semiconductor between two layers of the other type of semiconductor. |
| integrated circuit | a thin slice of semiconductor that contains many diodes, transistors, and other electronic parts. |
| electonmagnetic wave | a wave made up of changing electic and magnetic fields. |
| amplitude | the height of a wave. |
| frequency | the number of waves that pass a given point each second. |
| amplitude modulation (AM) | changing the amplitude of a wave to carry an electronic signal. |
| frequency modulation (FM) | changing the frequency of a wave to carry an electonic signal. |
| computer | an electronic device that stores, changes, and finds information. |
| binary system | a number system that uses only two digit -0 and 1. |
| hardware | the physical parts of a computer make up a computer. |
| central processing unit | directs everything the computer does. |
| imput device | a hardware that puts data into from the CPU. |
| output device | a hardware that puts out data from the CPU. |
| software | tells a computer what to do. |
| computer programmers | special computer languages to write the instuctions for computers. |
| computer network | a group of computers connected by wires or by telephone lines. |
| internet | a global network that links millions of computers. |
| World Wide Web | a system that allows you to find and look at files on the internet. |
| encryption | a way to code information so that only a user with permission can read. |
| computer virus | a program that affects the way a computer is supposed to opperate. |
| chat room | an internet page that allows many users to trade messages at the same time. |
| intellectual property | any idea or creative work. |
