Which component of the CRT is responsible for generating the electron beam?

The component of the CRT (cathode-ray tube) responsible for generating the electron beam is the electron gun. This component plays a crucial role in the overall function of the CRT, as it produces the electrons necessary for creating images on the screen. The electron gun consists of a heated cathode that emits electrons through thermionic emission. Once the electrons are emitted, they are focused and accelerated by various components within the gun before being directed towards the phosphor-coated screen.

In the context of the CRT, the electron beam travels from the electron gun toward the phosphor screen, where the impact of the electrons causes specific areas of the screen to glow and produce an image. The deflection system guides and directs the electron beam to the appropriate locations on the screen to create the desired visual output. The power supply provides the necessary energy for the entire system to operate but does not directly generate the electron beam itself.

Overall, the electron gun is fundamental to the CRT's ability to produce images, making it the correct choice for this question.