In a Thermionic Diode Electrons Move from the?

A diode vacuum tube or thermionic diode is a vacuum tube with two electrodes, a heated cathode and a plate, in which electrons can flow in only one direction, from cathode to plate.

How does a thermionic diode work?

A thermionic diode is an evacuated glass globe. Into this is put one plate (the cathode), that will emit electrons easily when heated, a heater and another plate to collect the electrons (the anode). When the heater is switched on the cathode is heated and electrons are emitted.

What is the source of electron in thermionic diode?

The thermionic diode. The simplest possible valve consists of a source of electrons, called the cathode, and a metal plate called the anode. The anode and cathode are mounted inside a glass or metal envelope from which the air has been pumped out to form a vacuum.