Question

How does a cathode ray tube work?

What I want to write:

Energy is given to the cathode , thus allowing an energy beam to be crated between the positive charge on one end of the tube, and the negative charge on the other end.

Can I add anymore? Also, would it be reasonable to add what it does swell or is that straying to far from the question?

Answer 1

What you have written is correct; however, I don't think it covers the subject that well. I would consider modifying what you have written. Also, I think it would be great to add what it does and I don't think that strays from the subject at all. Here is a link from Wikepedia. That should give you enough information to write a nice one or two page summary. Remember paraphrase what you read from other sources; that is, don't copy word for word. That is plagiarism.
Forgot the link.
https://en.wikipedia.org/wiki/Cathode_ray_tube

Answer 2

I probably could write a one or two page summary, but I have to condense al lot that to about 3 sentences, so rephrasing my question I guess, in the shortest way possible, how does a cathode ray tube work?

Answer 3

In short:
a cathode is heated until electrons are boiled out, then an accelerating field is applied which moves the electrons in a path towards phosphor coated screen. With suitable deflecting fields, the beam can be moved about to strike certain areas. A large positive voltage is applied to the screen itself to drain off the spent electrons.