Operation of CRTĬathode Ray Tube (CRT) is a computer display screen, used to display the output in a standard composite video signal. This screen is coated with phosphor, which glows when struck by the beam. This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat screen at the other end of the tube. In a TV’s cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. The anode is positive, so it attracts the electrons pouring off the cathode. The ray is a stream of electrons that naturally pour off a heated cathode into the vacuum. In a cathode ray tube, the cathode is a heated filament and it placed in a vacuum. And also when the external magnetic field is reversed, the beam of electronics is deflected in the opposite direction. The electrons deflected by the magnetic field. A moving charged body behaves like a tiny magnet, and it can interact with an external magnetic field. Therefore a cathode ray must consist of negatively charged particles. When an electric field is applied across the cathode ray tube, the cathode ray is attracted by the plate bearing positive charges. When the ray strikes the specially coated surface, the cathode ray produces a strong fluorescence or bright light. The cathode ray is drawn to the positively charged plate, called the anode, where it passes through a hole and continues traveling to the other end of the tube. When the two metal plates are connected to a high voltage source, the negatively charged plate called the cathode emits an invisible ray.
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