1. The problem statement, all variables and given/known data I'm have a little problem with understanding the workings of a cathode ray tube. I understand that a filament is heated and that in turn heats the cathode which, due to thermionic emission emits electrons. OK so here is my problem. A positively charged anode is used to attract the electrons towards the screen but how come the electrons do not stick to this "positively" charged anode but instead continue past it to the screen? I hope you understand what I mean! I'm sorry if I posted this in the wrong forum. I'm new here.