| Term | Definition |
|---|
| signal | a sign that represents information such as a command dirction or a warning |
| code | a set of rules used to interpret signals that convey information |
| telecommunication | a communication method that used electromagnetic means |
| analog signal | a signal corresponding to a quantity whose values can change continuously |
| digital signal | a signal that can be represented as a sequences of discrete values |
| optical fiber | a hair thing transparetn strand of glass or plastic that transmits signals using pulses of light |
| physical transmission | a transmission of a signal using wires, cables or optical fibers |
| atmospheric transmission | a transmission of a signal using electromagnetic waves |
| carrier | a continous wve that can be modulated to send a signal |
| modulate | a change to waves amplitude or frequency in order to send a signal |
| cathod ray tude | a tube that uses an elctron beam to vreat a display on a phosphorescent screen |
| pixel | the smallest element of a disply image |
| computer | an electronic device that can accept date and instructions follow instructions and output the results |
| Randon Access Memory (RAM) | computer memory that can be erased |
| Read only Memory (ROM) | computer memory that can not be erased |
| hardware | equipment that makes up a computer system |
| software | the instructions data and programming that makes a computer work |
| operating system | the software that controls a computers activities |
| Internet | a large computer network that connects many local and smaller networks |
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