| A | B |
|---|
| electronics | branch of the study of electricity dealing with the behavior of electrons in a vacuum or in special materials |
| diode | type of vacuum tube containing two electrodes, designed to allow electric current to pass through in only one direction |
| triode | type of vacuum tube containing three electrodes |
| semiconductors | substances that are neither good conductors nor good insulators |
| cathode-ray | the Crookes tube and the television picture tube use |
| electrons | Sir JJ Thomson discovered that cathode rays are actually streams of |
| doping | adding arsenic atoms to a crystal of silicon in order to increase ins conductivity |
| p-type | a material containing an excess of holes in the crystal lattice is this type of semiconductor |
