The filament of an electric bulb is a thin coiled wire made of tungsten. The reason behind why the filament is coiled is to produce resistance. Resistance can be simply defined as Friction produces in the way of electric current.
Why the filament of the bulb is coiled?
The filament is coiled to give it greater length. If the filament was just a piece of straight wire it would only give out a small amount of light. By curling the wire into a coil, a very long length of wire can be stored in a small space. When electricity flows through the coil it can give out much more light.
Why do we use coiled tungsten in electric bulbs?
Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).
Why do you think the filament is so skinny Why is it so twisted?
In order to get sufficient resistance for 120V or 240V, the filament needs to be very long and thin. This would be difficult to fit into the bulb. Also, this exposes less of the filament to the inert gas in the bulb, so there is less convection loss of heat. In some bulbs, the coiled filament is coiled again.
Why the filament of bulb has high melting point?
A filament is made up of a substance having high melting point(like tungsten) because A bulb lights up by heating the filament. … Also,bulb is filled with a noble gas or a very less reactive gas(like nitrogen,argon) so that the heated element should not react with it.
Why are jug elements and light bulb filaments coiled and looped?
Filaments in incandescent light bulbs are made of tungsten. When electric current goes through the filament, the filament glows. It may also be known as the electron emitting element in a vacuum tube. To make the bulb produce more light, the filament is usually made of coils of fine wire, also known as the coiled coil.
What is the main advantage of coiled coil lamp?
The advantage of the coiled coil is that evaporation of the tungsten filament is at the rate of a tungsten cylinder having a diameter equal to that of the coiled coil. The coiled-coil filament evaporates more slowly than a straight filament of the same surface area and light-emitting power.
Is used in electric bulbs?
Incandescent light bulbs consist of an air-tight glass enclosure (the envelope, or bulb) with a filament of tungsten wire inside the bulb, through which an electric current is passed.
What will be the current drawn by an electric bulb of 40?
Hence, the current drawn by an electric bulb of 40W is 0.18 A.
Is it OK to throw away LED light bulbs?
Light-emitting diode, or LED, light bulbs are about 90 percent more efficient than incandescent bulbs. The electrical current passes through a microchip, which lights up tiny LEDs. LEDs do not contain hazardous chemicals, so it is safe to throw them away in the trash can.
Can you throw lightbulbs away?
Incandescent bulbs and lamps can be tossed into the trash. If a bulb is broken, wrap it first in paper or plastic before placing it in your trash bin. This prevents broken edges from cutting through your garbage bag and creating a mess, and it helps protect you and your waste hauler from accidental injury.
Which gas is filled in electric bulb?
General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. While inert gas reduces filament evaporation, it also conducts heat from the filament, thereby cooling the filament and reducing efficiency.