Element used in bulb is
________
Answers
Answer:
Tungsten:-
Most incandescent bulbs use tungsten as a filament element. Tungsten is an inexpensive metal that has a long lifespan as a filament. It is a suitable option for incandescent bulbs because it has an extremely high melting point and is flexible.
Explanation:
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Answer:
tungsten
Most incandescent bulbs use tungsten as a filament element. Tungsten is an inexpensive metal that has a long lifespan as a filament. It is a suitable option for incandescent bulbs because it has an extremely high melting point and is flexible.
Explanation:
◉LET'S EXPLORE MORE
✯What is Tungsten?
Tungsten, also known as wolfram, along with Cr and Mo, belongs to group 6 of the periodic table.
Symbol : W
Atomic Number: 74
Atomic Mass : 183.84 amu
Discovered by : Fausto and Juan Jose de Elhuyar, 1783
✯Applications of Tungsten
- Tungsten is an economically important metal, being widely used in light-bulb filaments, electron and television tubes, abrasives and special alloys such as steels tool.
- Tungsten carbide is of great importance to metal-works, in the mining and petroleum industries. Contamination from these sources is therefore possible in industrial and urban areas.
- Evidence for a significant biological role for Tungsten is sparse, in contrast to Molybdenum, which is an essential trace element, although minor concentrations in some plants suggest a specialized function perhaps substituting for Molybdenum when there is a deficiency.
- There is limited ecotoxicity data available, anything higher than trace amounts of Tungsten in solution is generally considered to be toxic.
✯properties of tungsten are desirable for the filament of electric bulb:
- High Melting Point
- High corrosion resistance
- High temperature
- Lowest thermal expansion
- Inactive to react with other gases
◉FURTHER LEARNING
✯What is Bulb
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a bulb to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass.
✯ Inventor of the light bulb?
Thomas Edison
Thomas Edison and the “first” light bulb
In 1878, Thomas Edison began serious research into developing a practical incandescent lamp and on October 14, 1878, Edison filed his first patent application for "Improvement In Electric Lights".
✯Advantages of Incandescent Bulb
Following are the advantages of Incandescent Bulb:
➨It is less expensive due to lower initial cost.
➨It is easier to dim with rheostats.
➨It produces warmer color compare to fluorescent and thungsten-halogen lamps.
➨It generates relatively high light output.
➨It can be dimmed or controlled.
➨It is easy to install.
➨It is available in various shapes, sizes and applications.
➨It can be switched ON immediately.
✯Disadvantages of Incandescent Bulb
Following are the disadvantages of Incandescent Bulb:
➨It is energy inefficient.
➨It has very short lamp life time i.e. about 1000 hours typically.
➨It is warm source of light and hence requires air conditioning to cool the room.
➨It has higher operating cost.
➨It is very fragile and hence needs to be handled very carefully.
➨It generates low lumen per watt. Ordinary incandescent bulbs produces about 5 to 20 lumens per watt. This means it has lower efficacy.