The term 'cathode ray tube' refers to a vacuum tube that uses an electron beam to produce images on a phosphorescent screen. It is composed of three parts: an ION, a positive electrode (pos), and an ANODE. The ION is a charged particle that is accelerated by the electric field between the cathode and ANODE. The pos is a positively charged electrode that attracts the electrons from the ION. The ANODE is a negatively charged electrode that repels the electrons from the ION.