Electric discharge lamp, also called Vapour Lamp, lighting device consisting of a transparent container within which a gas is energized by an applied voltage and thereby made to glow. … Mercury vapour in a neon lamp gives a bluish light; mercury is used also in fluorescent lamps and some ultraviolet lamps.
How does light from electric discharge work?
Several types of lamps produce light by establishing a permanent electric arc in a gas. This process is known as electric discharge, or gaseous discharge. … It receives light from the arc inside the lamp and changes the light to the desired color as it glows through the glass.
What is an example of an electric discharge?
Electric discharge denotes the excitation of atomic states in a gaseous medium on passing an electric current through the medium. An ordinary household fluorescent lamp is an example of an electric-discharge source.
Is light from electric discharge efficient?
Modern electrical light sources
They are inexpensive, reliable, and readily available, but they are inefficient in their use of energy. Luminescent lamps, which produce less heat than incandescent lamps, include electric discharge lamps, semiconductor lamps, and chemical lamps.
What is the purpose of electric discharge?
Electrical Discharge Machining (EDM) is a controlled metal-removal process that is used to remove metal by means of electric spark erosion. In this process an electric spark is used as the cutting tool to cut (erode) the workpiece to produce the finished part to the desired shape.
What are the 4 types of electric discharge fluorescent lamps?
- 21.5. 2.1 Principle. …
- 21.5. 2.2 Run-up efficiency. …
- 184.108.40.206 Discharge lamp types. Discharge lamp types include low pressure mercury (fluorescent), induction, high pressure mercury vapour, mercury-blended, metal halide, low pressure sodium and high pressure sodium.
Which is the high electric discharge?
For instance, high voltage electric discharge (HVED) disrupts cell tissues in liquid samples and subsequently enhances extraction of valuable compounds from plant food materials and by-products.
What is the process of electric discharge?
An electric discharge is the release and transmission of electricity in an applied electric field through a medium such as a gas. … As the charge on these particles builds up, the result is the often-spectacular discharge of electricity known as lightning.
What is electric discharge class 8?
Answer: When negative and positive charges meet, producing streaks of bright light and sound. This process is called an electric discharge. When the accumulation of charges between lower part of clouds and earth becomes large, it is sufficient to break the insulation of air.
Is lightning a form of static electricity?
Lightning is caused by a buildup of static electricity inside a storm cloud. Moving around inside the cloud are tiny water molecules called hydrometeors. These hydrometeors are colliding and bumping into each other—creating a static electric charge. … That’s essentially a tiny lightning bolt you created.
Is electric discharge incandescence?
Sources of Light – Incandescence, Fluorescence, Bioluminescence, Chemiluminescence, Phosphorescence, Electric Discharge. Incandescence is light emitted from material because of the high temperature of the material. In a conventional incandescent light bulb, the excited atoms in the tungsten wire give off light.
Why do we use a discharge tube instead of a light bulb?
the helium is used instead of a light bulb because a certain element only emits certain wavelengths of light while the bulb would emit all wavelengths, and even if you were to split this with a prism you would still see all the colors and not specific ones.
What Colour does helium glow?
|Helium||White to orange; under some conditions may be gray, blue, or green-blue.|
|Argon||Violet to pale lavender blue|
|Krypton||Gray, off-white to green. At high peak currents, bright blue-white.|
What is the power of discharge?
In this case, the discharge rate is given by the battery capacity (in Ah) divided by the number of hours it takes to charge/discharge the battery. For example, a battery capacity of 500 Ah that is theoretically discharged to its cut-off voltage in 20 hours will have a discharge rate of 500 Ah/20 h = 25 A.
What do you understand by electric charge and discharge?
Static electricity refers to the electric charge of an object and the related electrostatic discharge when two objects are brought together that are not at equilibrium. An electrostatic discharge creates a change in the charge of each of the two objects.
Why is lightning called electrical discharge?
Lightning is an electrical discharge produced to balance the differences between positive and negative charges within a cloud, between two clouds, or between the cloud and the ground. … A negative charge at the base of the cloud is attracted to a positive charge at the earth’s surface.