Physical Science : How Does a Cathode Ray Tube Work?

A cathode ray tube consists of an electron gun, focusing coils, and X and Y plates. Learn how a sawtooth works in a cathode ray tube with information from a science teacher in this free video on physical science lessons.

Expert: Steve Jones
Bio: Steve Jones is an experienced mathematics and science teacher.
Filmmaker: Paul Volniansky

[MrLewisMovies]

Can somebody explain this to me. At 1:22 he says the beam will move to the right. But if the negative plate is on the right, wouldn't the beam go to the left?

[smartmaxxx]

please correct me if im wrong but .. the Y-plates are responsible for the Vertical deflection while the X-plated are responsible for the Horizontal deflection.

[Masowai]

I always wondered how the electrons were aimed!
The X and Y PLATES! Of course! Thanks Man!

[AngelzCharm]

Thank you! All of your videos are nicely presented.

[Jonasinc]

That is a good explanation. If I wanted to increase the brighness of a television, how could I do it without using the television controls?

[mallrat]

@fauld5 No. Electrons will be attracted to the positively charged plates so when they are horizontal (X plate), the electrons will go towards the +ively charged plates. Same thing with the Y plate.
When they use deflection coils instead of plates, the horizontal coil will deflect the electrons horizontally and the vertical plate will deflect it vertically (right hand palm rule)

[Video_Mavin]

What is the typical velocity of the beam? From Cathode to the Screen? I think this is the correct thing to ask. What is the electron potential of the beam itself?

[chanderinitpo]

Sir... Please can I get the reason for bending of cathode rays towards north n repulsing south... With the direction of magnetic field?

[foppe]

aah very nice explanation always was curious about this one ^_^ this is the part where the hz being controlled to right ?_? x and y plates ?

[Chiffonkek]

@busybuzzbuzz Cuz he was imagining the screen IN FRONT of him. Physics still dictate that the -ve plates WILL REPEL electrons. Only way to get that to the right is if you're viewing the screen from the front.

[surajpadakanti]

I thought the x plates were vertically placed and the y plates were horizontally placed. Correct me if I am wrong cause I ain't sure

[VirajTakale]

x plates are responsible for displacement in y direction and y plates are responible for displacement along x dirc. at 1.22 he messed up lil bit, all he meant to say was that if u adjust the charges on plates v can cover the whole 2-D screen.

[paulosiria]

what happens if a gas is maintained in CRT

[abhimanyutimbadia]

the x plates and y plates have been interchanged

[monterey]

@ElecCorris yea thats what i wouldve thought

[bilos]

No. Plasma TVs use liquid crystals. It's the same as LCD monitors.