Table of Contents
What is the purpose of a choke in tube light?
The vapor gets excited and produces ultraviolet radiation which interacts with the phosphor coating on the inner walls of the tube light and the phosphor produces the glow of the light emanating from the tube light. A choke coil is used to produce this high voltage across the tube.
What is the primary purpose of the choke in a fluorescent lamp?
the choke is a high resistance which limits the current reaching critical limits.
Why do we connect a choke ballast in series with fluorescent lamp?
A fluorescent lamp, a device with negative differential resistance. In operation, an increase in current through the fluorescent tube causes a drop in voltage across it. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current.
Why is choke used?
A choke, also known as an inductor, is used to block higher-frequency while passing direct current (DC) and lower-frequencies of alternating current (AC) in an electrical circuit. The name comes from blocking, or “choking”, high frequencies while passing low frequencies.
What is electronic choke in tube light?
The purpose of the choke is to provide a very high voltage initially between the filaments (across the two ends of the tube light). Again once the gas in the tube is ionized the choke provides a low voltage. A choke is a coil of wire. Fluorescent tubes/lamps are filled with mercury vapor.
What is choke function?
In electronics, a choke is an inductor used to block higher-frequency alternating currents while passing direct current (DC) and lower-frequencies alternating current (AC) in an electrical circuit.
How does a tube light glow?
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.
What is the difference between choke and ballast?
The ballast you refer to as found in a fluorescent lighting fixture is special kind of choke it limits the current flow so the tube does not burn out too quickly. The sort of choke you call an electronic choke is very much smaller and most often used at radio frequencies.
How does the choke heat riser tube work?
The gas will corrode the metal in the pipe and the choke cover. The plumbing path is filtered air down to the manifold, air heated by the sealed tube passing through the manifold, hot air back up to the choke cover, and exiting by the vacuum pulloff piston into the intake manifold.
Why does tube lighting take some time to glow after?
An inductance has a longer time constant and a resultant slower voltage build up for extraction of electrons from the cathode. These features of the ballast circuit often require more than one attempt for the gaseous excitation. This lead to slower start and start up flickering of the tube lights.
Which is the best description of choked flow?
Summary Choked flow is a phenomenon that limits the mass flow rate of a compressible fluid flowing through nozzles, orifices and sudden expansions. Generally speaking it is the mass flux after which a further reduction in downstream pressure will not result in an increase in mass flow rate.
Where does the current go in a choke?
Current flows through the starter at first, and current flows through the choke (as current flows through the coil and the points in the car, while the points are closed).