Incandescent Light Bulb Working Explained with 3D Animation

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Transcript

00:00Why are the incandescent light bulbs that accompanied our childhood gradually being eliminated?

00:06First, we need to understand how they work.

00:10Their structure is very simple.

00:12The core is the filament inside.

00:15It is generally made of tungsten.

00:17This is because tungsten has a high resistivity.

00:21When current passes through it, it generates a lot of heat,

00:24and the melting point is as high as about 3,422 degrees Celsius.

00:30It can work at very high temperatures without melting.

00:33The outer shell of the bulb is made of glass.

00:36It is used to protect the internal components.

00:39To prevent the filament from oxidizing at high temperatures,

00:42and to prolong the life of the filament,

00:45the inside of the bulb is filled with inert gases such as argon or nitrogen.

00:50Finally, the bulb is fixed on a lamp holder made of metal.

00:54When the bulb is powered on, current flows through the filament.

00:58The temperature of the filament gradually increases.

01:01Usually, it can reach 2,000 to 3,000 degrees Celsius.

01:05The bulb begins to glow.

01:07As the temperature rises, the spectrum emitted will move to the higher energy visible light range,

01:12and finally, bright white light is emitted.

01:16This phenomenon is also called blackbody radiation.

01:19But the light efficiency of incandescent bulbs is low.

01:23Most of the electrical energy is converted into heat energy rather than light energy.

01:28This is why they are gradually being eliminated

01:31and being replaced by more efficient LED lights and fluorescent lights.

01:36Like and follow for more informative videos.

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