What is the working principle of tube light?

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.

How do fluorescent lights work step by step?

Fluorescent lamps work by ionizing mercury vapor in a glass tube. This causes electrons in the gas to emit photons at UV frequencies. The UV light is converted into standard visible light using a phosphor coating on the inside of the tube.

How does a fluorescent light work kids?

How it works. An electric current is applied to mercury vapor inside the tube, causing it to emit ultraviolet (UV) light. A phosphor on the walls of the tube absorbs the ultraviolet light. This causes an electron to jump up to an orbital with a higher energy.

How does an electronic ballast work?

An electronic ballast uses solid state electronic circuitry to provide the proper starting and operating electrical conditions to power discharge lamps. An electronic ballast can be smaller and lighter than a comparably-rated magnetic one.

What are the components of Tubelight?

The materials used mainly inside the tube light are as follows:

• Endcap.
• Glass stem.
• Mercury drop.
• Inert gases (argon).
• Electrode shield.
• Filament coils as electrodes.
• Phosphor-coated glass bulb.

Why capacitor is used in tube light?

Fluorescent lamps form an inductive load on the AC mains supply. As a result large installations of such lamps suffer a poor power factor and resultant voltage drop. Adding a capacitor to each lamp corrects the power factor bringing it back close to unity (1.0).

How tube light circuit is connected and how it works?

How tube light circuit is connected and how it works? When we give the power to turn on the tube light, the voltage comes to this side with the help of starter and ballast and due to full voltage, the gas in the starter becomes ionized and heats the bent bimetallic strip to be connected to a fixed contact.

How does a fluorescent tube work a level physics?

Fluorescent tubes are filled with low pressure mercury, when an electric current is passed through, the electrons in mercury are excited and move to a high energy level, this high level state is unstable and so the electron moves back to its original state, but on doing so, it emits an electromagnetic wave with energy …

What is inside the tube light?

A fluorescent lamp consists of a glass tube filled with a mixture of argon and mercury vapour. Metal electrodes at each end are coated with an alkaline earth oxide that gives off electrons easily. When current flows through the gas between the electrodes, the gas is ionized and emits ultraviolet radiation.

Does a ballast convert AC to DC?

Working Principle of an Electronic Ballast Electronic ballast takes supply at 50 – 60 Hz. It first converts AC voltage into DC voltage. After that, filtration of this DC voltage is done by using a capacitor configuration.

Which gas is used in tube light?

A fluorescent lamp tube is filled with a gas containing low pressure mercury vapour and noble gases at a total pressure of about 0.3% of the atmospheric pressure.

What is the function of capacitor in a fluorescent lamp?

A capacitor is used to improve the power factor of the lamp. To prevent the lamp from taking too much current a fluorescent lamp has to have a choke, which has magnetic inductance. As a result large installations of such lamps suffer a poor power factor and resultant voltage drop.

How are electrons excited in a fluorescent tube?

(i) As they pass through the fluorescent tube, they collide with the mercury atoms within it and this collision transfers energy to the atom. This energy transfer allows the atom’s orbiting electrons to move to a higher energy state thus exciting the atom.

How do fluorescent lights work GCSE?

Why tube light is white?

However, since ultraviolet rays are not visible to the human eyes, the inside of the glass tube is coated with a fluorescent material that converts ultraviolet rays to visible light. It is this coating that causes fluorescent lamps to glow white.

What is the size of ballast?

The size of ballast used under point and crossings is 25 mm. Quality of stone ballast required per metre tangent length of broad guage is 1.11 cu. m and for metre gauge, it is 0.767 cu. m.

Is a ballast a transformer?

A transformer changes the amperage and / or voltage. It literally “Transforms” electrical energy. A ballast is like a capacitor. Think of a ballast as a short-term battery.

How tube tube light works?

Tube light is a lamp that works on low pressure mercury vapor discharge phenomenon and converts ultra violate ray into visible ray with the help of phosphor coated inside glass tube. The materials used to build a tube light are given below. The tube light does not work directly on power supply.

What materials are used to make a tube light?

Material Used Inside the Tube Light. The materials used to build a tube light are given below. Filament coils as electrodes. Phosphor coated glass bulb. Mercury drop. Inert gases (argon) Electrode shield. End cap.

What is the working principle of a starter in a tube light?

Starter: The starter is a small neon glow up lamp that contains a fixed contact, a bimetallic strip and a small capacitor. Working Principle of Tube Light When the switch is ON, full voltage will come across the tube light through ballast and fluorescent lamp starter. No discharge happens initially i.e. no lumen output from the lamp.

What happens when the switch is on on a tube light?

When the switch is ON, full voltage will come across the tube light through ballast and fluorescent lamp starter. No discharge happens initially i.e. no lumen output from the lamp.