A cathode ray tube (CRT) accelerates electrons to about 10 keV of energy, which corresponds to a potential difference of approximately 10 kV. The tube emits visible light when electrons collide with the pixels. Additionally, the emission of X-rays from the CRT is minimal and complies with international safety standards. It is important to note that volts represent the force driving the electrons rather than something emitted. Understanding these principles is crucial for grasping the operation of cathode ray tubes.