| It consists of a thermionic tube with a cathode, an anode and a third electrode which is called the collector or counter electrode. |
| When the main power supply of the X-ray tube is on, the cathode emits thermions as it is heated by a heater. |
| A cathode emits a stream of electrons that collides with neutral atoms of xenon, a gaseous element, in a chamber. |
| That is more rarefied than the near vacuum in a television cathode ray tube. |
| There's also the classic cold cathode fluorescent lamp light sticks, and basic LED spots that can be placed anywhere in the case. |
| Its positive terminal is connected to the anode and its negative terminal to the cathode where the reduction of the metal ion takes place. |
