Working Principle Of Fluorescent Lamp

September 19, 2024 Post a Comment

Working principle of fluorescent lamp

Common uses and advantages. Fluorescent lamps give light from a large glowing surface rather than a small intense source. These lamps are commonly used in situations which call for general illumination at an even level such as offices, classrooms, retail stores, hallways, and cafeterias.

How does a fluorescent light work physics?

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 principle used by a ballast in a fluorescent lamp?

As soon as the current starts flowing through the touched contacts of the neon bulb of the starter, the voltage across the neon bulb gets reduced since the current, causes a voltage drop across the inductor(ballast).

What are the 4 parts of fluorescent lamp?

Compact fluorescent components consist of cover, coil glass tube, phosphor coating, mercury vapor, ballast, ballast cover, and base.

Which gas is used in fluorescent lamp?

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.

What are the parts and functions of fluorescent lamp?

There are two very distinct parts to fluorescent lighting: the tube and the fitting. Fluorescent tubes ionise mercury vapour to produce ultraviolet light, which is converted to visible light by the phosphor coating on the inside face of the tube.

What's inside a fluorescent bulb?

The central element in a fluorescent lamp is a sealed glass tube. The tube contains a small bit of mercury and an inert gas, typically argon, kept under very low pressure. The tube also contains a phosphor powder, coated along the inside of the glass.

Why is mercury used in fluorescent lights?

Mercury is an essential element in the operation of fluorescent lighting; it allows the bulbs to be an efficient light source. Because CFLs contain trace amounts of mercury, it is important to educate yourself on proper use, recycling and disposal of these products.

Why does a fluorescent tube not generate heat?

Fluorescent lamps also do not produce as much heat as traditional lighting options. They make about 75% less heat compared to an incandescent bulb because they are not using resistance to emit light. That also results in an energy savings, and also helps to keep whatever room they are in at a cooler temperature.

Why choke is used in fluorescent lamp?

Detailed Solution. In fluorescent lamp circuit, Ac power pass through a 'choke' or 'reactor', this limits current and prevents the lamp from creating a type of short circuit which would destroy the lamp. All arc discharge lamps need a choke to limit current.

Can a fluorescent light work without a ballast?

All fluorescent bulbs require a ballast. All compact fluorescent (CFL) bulbs require a ballast, which is often integrated. All HID bulbs require a ballast, which is sometimes integrated. No LED bulbs require a ballast, although some are engineered to work with an existing ballast.

What is the use of capacitor in fluorescent lamp?

The capacitors in fluorescent light are as Resqueline says primarily to correct the power factor. These are connected across the supply. They also help on switch off, reducing the arc in the switch due to the inductance.

What are the types of fluorescent lamp?

There are three main types of fluorescent lamps: cold cathode, hot cathode, and electroluminescent. They all use phosphors excited by electrons to create light. On this page we will discuss the cold and hot cathode lamps. Electroluminescent lamps use "fluorescence" but are so different they are covered on another page.

What are the two classification of fluorescent lamp?

The most common lamp type is the four-foot (F40), 1.5" diameter (also called T12) straight fluorescent lamp. More efficient fluorescent lamps are now available in smaller diameters, including the 1.25 " (also called T10) and 1" (also called T8).

What are the three main parts of fluorescent lamp?

A fluorescent fixture has three main parts -- the bulb, ballast, and starter.

Can fluorescent lamp be used in DC?

A fluorescent tube can be operated on both AC as well as DC.

Is helium present in fluorescent light?

Detailed Solution. The correct answer is Helium.

What does fluorescent lamp mean?

Definition of fluorescent lamp : a usually tubular electric lamp having a coating of fluorescent material on its inner surface and containing mercury vapor whose bombardment by electrons from the cathode provides ultraviolet light which causes the material to emit visible light.

Can a fluorescent light work without a starter?

Conventional fluorescent tubes need a starter. This starter provides ignition voltage. Naturally, this isn't necessary for LEDs, so the ignition voltage is superfluous. If you want to replace a traditional fluorescent bulb with an LED, then you must install a dummy starter or bypass the standard starter manually.