| A | B |
|---|
| Alternating Current | Electrical current that reverses its direction regularly and continuously. (found in outlets) |
| AM | Modulation technique whereby information is conveyed through the amplitude of the carrier signal. |
| Analog transmission | Signal transmission over wires or through the air in which information is conveyed through variation of some combination of signal amplitude or freqeuncy or phase |
| Attenuation | loss of communication signal energy |
| Circuits | communications paths between two or more points |
| conductor | any material with a low resistance to electrical current |
| digital signal | Language of computers comprising only two states on and off |
| Direct current | Electrical current that travels in only one direction |
| electrcity | electrons in certain atoms can be pulled free from the atom and made to flow |
| electrons | Particles that have a negative charge and orbit the nucleus |
| Electrostatic discharge | a flow or spark of electricity that orginates from a static source such as carpet |
| FM | Modualtaion technique in which signals of different frequencies represent different data values |
| Impedance | the total opposition to current |
| Latency | Delay between the time a device requests information and when it receives info |
| Multimeter | a tool used to measure voltage, current and resistance |
| Neutrons | particles that have no charge |
| Oscilloscope | device used to study electrical signals |
| PM | phase or beginning and ending points of a given cycle, of the wave is varied to carry the message |
| Propagation | travel |
| Protons | particles that have a positive charge |
