I have been studying the physics of accelerating electrons through a vacuum using an electron gun. It says that a potential difference (p.d.) is applied between the filament lamp and an anode. The electrical energy of the electrons is converted to the K.E as the electrons are attracted to the anode.
What does applying a p.d actually mean? I know a p.d is a measure of energy transferred by electrons per unit charge so does it just mean creating a difference in charge to cause an electric current?
How does increasing this difference in charge increase the potential difference?