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There is a vacuum around the filament Heat is the excitement of molecules and the fact there are none around the filament the heat cannot be transferred to the glass. It is the same reason you should not pick up a hot pot or pan with a wet towel and why a Styrofoam cooler works so well. Air is better than water for insulation and a vacuum is even better.
Wiki User
∙ 14y ago
Wiki User
∙ 10y agobecause of the outside air reacting with the filiment inside the bulb, it heats up and then cools down causing it to condense on the inside
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Why do bulb filament not burn?
The filament does not "burn", it just glows brightly. If some air were present in the bulb - as sometimes happens if a light bulb gets knocked and gets even a tiny crack in its glass bulb - then the oxygen present in ordinary air will quickly make the filament burn away.For more information see the answer to the Related question sghown below.
Can you use a 13.5 volt light bulb in place of a 12 volt Will it be burn as bright?
A 13.5 volt bulb will burn less brightly but last longer.
Will a light bulb burn or melt a rubber band?
It depends upon the wattage of the light bulb. The lower the bulb wattage the lower the heat generated by the bulb. A 100 watt bulb should generate enough heat to destroy a rubber band.
Why bulb filament does not burn at high temperature?
The metal will melt if you do that.
Why is the bulb evacuated?
If they were not evacuated of all outside air, the filament will burn up in seconds because the air Will cause Resistance, thus the filament will burn brighter and brigther tyring to burn off the air until it opens. (blown bulb)...
Why tungsten wire does not burn even though temperature inside the bulb is 2700 degrees celsius?
Tungsten has the highest melting point (3,442°C -or- 6,192°F) of all non-alloyed metals, and after carbon, it is the second highest.
Why do bulb filament not burn?
The filament does not "burn", it just glows brightly. If some air were present in the bulb - as sometimes happens if a light bulb gets knocked and gets even a tiny crack in its glass bulb - then the oxygen present in ordinary air will quickly make the filament burn away.For more information see the answer to the Related question sghown below.
What color flame do you get when you burn tungsten?
white
Why do lightbulbs burn out?
They burn out from 1) the rapid heating and cooling of the Tungsten filament, and 2) from the tungsten atoms being released from the metal filament by way of the extremely high temperatures. Eventually the tungsten metal fails and the filament breaks.
What temperature does tungsten burn at?
Tungsten starts to glow at about 1000 Kelvin, at 1200 Kelvin it is red, and around 1400 Kelvin it is bright red.
What causes a light bulb to turn black when they burn out?
As an incandescent light bulb is used, tungsten slowly evaporates from the filament causing it to get thinner. When it gets too thin it can no longer carry the current and part of it melts causing the bulb to blow out.
What is principle of electric bulb?
An incandescent light bulb is an appliance that converts electrical energy into visible light. When current goes through a modern light bulb, it passes through a series of connectors which are set up to deliver this current to the tungsten metal filament found at the center of the bulb.The filament is a resistor, when the current goes through it, the filament heats up. Shortly the filament becomes white hot and it begins to glow.A halogen light bulb is a special type of incandescent light bulb with extended lifetime.In an incandescent bulb the tungsten of the filament slowly evaporates, making the filament weaker and when it weakens enough it burns out. Also tungsten condenses out on the cooler glass bulb, darkening it.In a halogen bulb some type of halogen gas (e.g. fluorine, chlorine) is added to the mix of gasses in the bulb (e.g. argon, dry nitrogen), the halogen gas combines with the tungsten vapor then redeposits the tungsten back on the hottest parts of the filament.The hottest parts of the filament are the thinnest and most likely to burn out. The tungsten deposited on them thickens them making them less likely to burn out, and they cool slightly as their electrical resistance drops.A fluorescent light (e.g. CFL bulb) uses a tube filled with gasses (including mercury vapor) to create an electrical arc. This arc produces UV light.The inside of the glass tube is coated with a powdered chemical called phosphor, that absorbs UV light and emits visible light.An LED light bulb uses an array of ultrabright white light LEDs and a combination of prisms, lenses, and diffusers to scatter the light.LEDs are semiconductor devices that produce light at a PN junction in a material having a large bandgap between conduction and valence band energy levels, when electrons fall into holes in such a material they generate photons.
Can you bake a pie casing without baking beans?
no cause it will burn and taste sour
How do you change a fog light bulb in a 91 Firebird?
Reach underneath to get behind it. You then unplug the light (and holder) to reveal lamp. Similiar to the new halogen headlights where you replace just the bulb instead of the entire casing. It's really a pain to reach it. BE CAREFUL to not touch the glass part of the new bulb. Most are halogen and will burn out prematurely if grease or even oil from your fingers are left on it.
What makes a light bulb glow when a lamp is turned on?
In an incandescent light bulb a small coil of thin tungsten metal - which is not such a good conductor of electricity as copper - resists the flow of current so much that it heats up. The thickness of the tungsten is carefully designed so that it gets hot enough to give out visible light but does not get so hot that it melts and breaks.Another answerInside the bulb is a wire that goes to a piece of coiled tungsten (a heavy metallic element). This causes maximum resistance to the electricity flowing through the wire. The resistance causes the tungsten to heat up to 4,500 degrees F, so much that we see the glow as light. The glass bulb surrounding it contains an inert gas, protecting the filament from oxygen which would cause it to burn out immediately and also prevents contact with the white hot metal.For more information please click on the Related Questions shown below.
Properties of a resistors?
They are used in circuits and devices commonly (eg.the computer and TV) they slow the amount of electrons going through so that if you are plugged into the mains and have a light bulb that is small, the resistor would be put in place to the device eg.the light bulb doesnt burn out.
What will happen if a 20K bulb is connected to a 1200AH battery?
The bulb will burn for 15 minutes.
