Faraz Murtaza said:i have a doubt regarding the starting of a tubelight that whenever we switch on the light then we require a very high voltage to create the arc for the continuous flow of current, then how do we get such a large amount of voltage to produce this arc
sophiecentaur said:Without some help from the 'starter circuit' you would need a high voltage for a metre of low pressure gas to 'strike'. It is virtually, an open circuit. Once the mercury has become ionised, that same column becomes a very low resistance path. As Davenn says, you need a way of limiting the current or a fuse will blow. An inductive choke is mostly used these days but, in the past, it was not uncommon to use a filament lamp in series, to limit the current.
Faraz Murtaza said:as you are saying that without the need of starter we will require a high voltage, so my question is how do we get this high voltage? as the supply is of 240V and as i found to create an arc for current flow we require about thousands of volt. So, how do we get such a large amount of voltage?
jim hardy said:here is a pretty down-to-earth reprinted article that covers the starting schemes.
http://books.google.com/books?id=qO...e&q=BY MERLE HENKENIUS PM fluorescent&f=false
The voltage in a tubelight is generated through a process called fluorescent lighting. Inside the tube, there is a mixture of gases, including mercury vapor. When electricity passes through the tube, it excites the gas molecules, causing them to release ultraviolet light. This light then reacts with the phosphor coating on the inside of the tube, producing visible light. This process requires a high voltage to generate the necessary energy.
The voltage of a tubelight can vary depending on the size and type of tube, but it is usually between 600-800 volts. This high voltage is necessary to ionize the gas molecules and create the necessary energy for the fluorescent lighting process.
A tubelight has a built-in device called a ballast, which helps to regulate and maintain the high voltage needed for the fluorescent lighting process. The ballast is responsible for controlling the flow of electricity and preventing the tube from overheating or burning out.
Yes, the high voltage in a tubelight can be dangerous if proper precautions are not taken. It is important to always handle and install tubelights with caution and ensure that the electricity supply is turned off before making any changes. Additionally, it is not recommended to touch the tube while it is on, as the high voltage can cause electric shocks.
If the voltage in a tubelight is too low, the gas molecules will not be ionized enough to produce the desired amount of ultraviolet light for the fluorescent lighting process. This can result in dim or flickering lights, and the tube may eventually burn out. It is important to ensure that the voltage is properly regulated to maintain the longevity and efficiency of the tubelight.