Table of Contents
Why filament is used in a bulb?
the filament used in an electric bulb has to get heated up to a very high temperature in order to emit light. tungsten has a very high melting point, therefore, it is used as a filament in the electric bulb.
What will happen to the resistance of the filament after the light bulb has burned?
Eventually the filament becomes so weak that it breaks and electricity can no longer flow through the bulb.
Why doesn’t a bulb work when the filament inside it is broken?
One reason for a bulb to fuse is a break in its filament. A break in the filament of an electric bulb means a break in the path of the current between the terminals of the electric cell. Therefore, a fused bulb does not light up as no current passes through its filament.
What is a bulb filament made of?
tungsten
Now, filaments of electric bulbs are made up of tungsten. To understand why, let us look at some properties of tungsten that contribute to its versatility. As a metal, Tungsten is a good electrical conductor. It is also a good thermal conductor.
Why is filament used?
Note:Tungsten filaments are used in incandescent light bulbs. The filament, also known as the coiled coil, is normally made of fine wire coils to increase the bulb’s light output.
Why does the filament of a bulb becomes hot?
The typical incandescent light bulb contains a thin wire (usually tungsten) called a filament that has a high electrical resistance. This filament gets very hot when an electric current passes through it. Actually, the filament gets so hot it literally boils off atoms and electrons.
What happens to the light of the bulb?
When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light.
What will happen to the bulb?
Bulb is considered too big to go through that process. Instead, a firm of special administrators will take over the day-to-day running of the company. They will be named in the next few days. In reality, Bulb customers will see no difference, and any credit balance that they built up on their account is protected.
Why should we not touch a lighted bulb?
Answer: we Should not Touch The Lighted Bulb As Due to Flow Of Current The Bulb get heated While Touching It can harm Or Damage That Person..
Can Nichrome be used in bulb?
Nichrome is not used as filament in incandescent lamps.
What is the purpose of a bulb filament?
Answer Wiki. The purpose of bulb filament to convert electrical energy into heat energy and hence it glow at very high temperature (light energy). As per the Joule’s law of heating effect the heat generated in a resistor will be directly proportional to it’s resistance that’s why we coil the tungsten to increase the resistance in less space.
Is the light bulb still the best way to light a house?
Cheap, effective and easy-to-use, the light bulb has proved a monstrous success. It is still the most popular method of bringing light indoors and extending the day after sundown. But by all indications, it will eventually give way to more advanced technologies, because it isn’t very efficient.
Why does a tungsten bulb emit light?
That power in the environment of the bulb will raise the temperature of that filament to a level that causes it to emit light. Anything at high temperature will emit light, a piece of wood in a fire emits light a flame in a cooking oven emits light. Tungsten is not special from that perspective.
Why do incandescent light bulbs have a short lifespan?
At high filament temperatures tungsten evaporation—even though it is reduced by gas filling—is more rapid and leads to a shorter lamp life. Thus, the more efficient an incandescent lamp is the shorter is its life. Variations in supply voltage vary filament temperature, which, in turn, increases or decreases lamp life.