| A | B |
|---|
| electrons | What electricity is comprised of |
| current | The flow of electrons |
| voltage | Application of pressure or force |
| resistance | The opposition to the movement of electrons |
| impedance | the total opposition to current flow |
| circuit | A communication path between two or more points |
| ground | reference voltage level of 0 |
| conductor | Offer little resistance to electron movement |
| semiconductor | Can control the amount of electricity they conduct |
| insulator | offer high resistance to the movement of electrons |
| signal | the desired electrical voltage, light pattern or electromagnetic wave |
| noise | bits acquire unwanted energy from external sources |
| propagation | bits take time to travel along the medium |
| attenuation | bits lose amplitude as they travel, giving energy to the medium |
| reflection | some of the energy of the bit can bounce back in a direction opposite the original signal, causing confusion |
| dispersion | bits broaden in time as they travel |
| collision | bits from two different computers trying to communicate are on the same media at the same time |
