This is the process by which electrical discharge happens by ionization of the air molecules. It causes the immense loss of the electricity. Due to the corona discharge phenomenon, sharp points are avoided in the machine. This is the frequently encountered problem in the high voltage system where it is blamed for huge power loss. It is often indicated as the bluish glow around the high voltage metal conductor. Sometimes the color varies from bluish to different types of colors.
Unwanted consequences like the formation of Ozone, Nitric acid, etc. happens due to corona discharge. High voltage application like the X-ray generating machine, radio transmitters, etc., suffers from the unwanted consequence of corona discharge.
Corona discharge is frequently used in the photocopy machine, Ozone-generating devices, and many others everyday application.