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Why bulb filament does not burn at high temperature?
The metal will melt if you do that.
What happens when a substance reacts with oxygen?
Typically, that substance becomes oxidized.
What happens to the electrical energy carried by the current when it passes through the filament of a bulb?
it stays there. the electricity travels back and forth through the filament until you turn the lighbulb off.
When you turn on a light bulb you are observing the law of conservation of energy at work How is the law of conservation of energy at work in the light bulb?
When an electric current flows through the lamp filament, it is doing work (W) on that filament. This causes the internal energy (U) to rise which, in turn, causes its temperature to rise. Because the temperature is now higher than the surrounding temperature, heat(Q) transfer takes place to the surroundings.The change in internal energy of the filament is equal to the following:change in U = W - QThis equation accounts for all changes in energy in the filament.
What supports the anther?
The Filament
What happens to the filament when light bulbs blows?
The filament breaks.
What happens to the filament if the bulbs becomes brighter and brighter?
The bulb gets brighter because the filament is getting hotter. If the filament's temperature gets too high it will melt at some point and fall apart. The current will stop flowing and the bulb will "blow".
Why are V-i characterstics different for tungsten and carbon lamp?
As carbon filament bulbs have a negative temperature coefficient and tungsten filament light bulbs have a positive temperature coefficient.
What happens when a filament gets heated?
the bulb get fused
Why bulb filament does not burn at high temperature?
The metal will melt if you do that.
What is the difference between filament current and tube current?
The current supplied to the filament for heating is defined as the Filament current. whereas When the filament is heated to a high temperature, the electrons are emitted. The flow of electrons form Cathode to anode is the tube Current.
What temperature does a filament inside a light bulb reach?
Answer:The filament inside the light bulb reaches over 3000 degree Celsius.
What happens to the energy when you turn on an electric lamp?
Electricity flows through the filament, resistance in the filament causes heat and light energy to be created.
What happens to the resistance of a filament if it is replaced by a thicker wire?
The resistance decreases
What happens to the current in a filament is replaced by a longer wire?
resistance increases
What happens to the resistance of a filament if it is replaced by a shorter wire?
the resistance decreases APEX
What is the term for that bright light as a light bulb burns out?
I'm not sure there is an official name for it, I just always called it a flash. It happens because the tungsten filament is not pure tungsten, but an alloy to make the tungsten easier to draw into wire. Some of the alloying agents evaporate below the temperature of the operating filament. If enough evaporates in one spot, the resistance of that spot rises causing the spot to dissipate more power than the rest of the filament. When you turn the light off, the filament cools and its total resistance drops. When you turn the light on again, this low resistance causes a current surge. At the high resistance spot this current surge causes unusually high heating, vaporizing the tungsten at that point in a bright flash of light and burning out the bulb. Halogen bulbs delay this by running the filament very hot in a low pressure halogen gas enclosed in a quartz bulb to tolerate the high temperature. The halogen gas scavenges evaporated metal atoms, then migrates toward the filament. When the halogenated metal contacts the hot filament it dissociates, depositing the metal atom on the filament and the halogen goes back out to scavenge more evaporated metal. The dissociation process happens faster where the filament is hotter, which happens to be the spots that have evaporated the most so they tend to get filled in.
