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Current passing through a special wire like tungsten heat up the wire and create light by emitting photons
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Why does a light bulb filament glow?
The filament inside is heated. Once it gets hot enough, it dissipates some of the energy as heat and light.
What is the difference between a filament of a bulb and an element of an electric heater?
The heater element is thicker wire, and has lower resistance. It still has enough resistance to glow red hot (producing heat) but does not glow white-hot and very brightly like a light bulb filament. Also, it lasts almost indeifnitely. whereas the light bulb filament has a finite life - it will "burn out" sooner or later.
What energy trasnformations occur in a incandescent light bulb?
In an incandescent light bulb, electrical energy is transformed into thermal energy and then into light energy. When electricity flows through the filament of the bulb, it heats up and becomes white-hot, producing thermal energy. This thermal energy then causes the filament to glow and emit light energy.
Can you use a copper wire to make a filament of an electric bulb?
No, copper wire cannot be used to make the filament of an electric bulb as copper wire has very low resistance. Therefore, the bulb will not glow if current is passed. It would also melt - the filament has to be white-hot to be any use!
Why does the filament of a bulb glow when current flows through it?
Because the atoms of the filament convert the energy into light energy through a reaction of the electrons, though it does also emit thermal energy. When the current passes through the filament, it excites the atoms and most specifically the electrons (the higher the energy content, the further away they orbit the nucleus of the atom) and makes them vibrate, which in turn causes the electrons to move further afield as they absorb the energy. This causes the radiation of light. This is why filaments do not need electricity to work, merely a significant transference of energy.
The part of a light bulb that is a poor conductor so that the friction causes it to light up and glow?
That part of a light bulb that causes light to light up is called the filament, and it is typically made from tungsten.
What does the filament of a light bulb allows the light bulb to change electrical energy to?
The filament of a light bulb overs enough resistance to current flow, that the filament heats up so much that it will glow and produce visible light.
Is resistance in the filament of a lamp essential or not?
Yes, the resistance of the filament of a light bulb is what generates enough heat to make the filament glow and produce light.
How does a battery make a light bulb glow?
The flow of electrons from the battery flow through the filament in the bulb causing it to get hot and glow thus producing light.
What causes incandescent light bulbs to produce light?
The filament in the bulb has a high resistance to the flow of electricity. As electricity passes through it, the filament heats up and begins to glow, giving off the visible light you see.
Why does a fused bulb not glow?
A fused bulb does not glow because the filament of a fused bulb is broken. Since current can't flow through the filament, it can't get hot enough to glow.
What does a light bulb have to do with an electrical light source?
A light bulb is a source of electric light. In an incandescent light bulb, the glass bulb forms a protective shield around a glowing filament. The air inside the glass bulb is removed, or replaced with an inert gas. Electric current is passed through a thin metal filament (usually tungsten), which causes it to glow white hot, giving out light. The protective bulb stops the filament from burning up, as it has no Oxygen.
What actually gives off light in a light bulb?
Electric current through a filament (thin spiral) of tungsten causes it to heat up enough to glow brightly.
Why does a light bulb filament glow?
The filament inside is heated. Once it gets hot enough, it dissipates some of the energy as heat and light.
Why is gas in a light bulb?
Mainly to prevent the filament, the glow wire from burning up.
Does the filament of an incandescent light bulb glow because it gets extremely hot?
yes
Is a light bulb a gas?
Mainly to prevent the filament, the glow wire from burning up.
