When the external power supply circuit, the output of the transformer will produce thousands of volts or even tens of thousands of volts of high voltage.
When this high voltage is applied to the electrodes at the two ends of the neon lamp, the charged particles in the neon lamp are accelerated in the high voltage electric field and fly to the electrode, which can excite a large number of electrons. These excited electrons are accelerated in a high-voltage electric field and collide with gas atoms inside the lamp. When these electrons collide with the energy of the free gas atoms, they ionize the gas atoms to form positive ions and electrons. This is the ionization of the gas. The collision between charged particles and gas atoms emits extra energy in the form of photons, which complete the process of lighting up a neon light.
