Physics Electric Current & Circuits Part 6 (Filament of Bulb) Class 7 VII | Summary and Q&A

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February 23, 2016
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Physics Electric Current & Circuits Part 6 (Filament of Bulb) Class 7 VII

TL;DR

The filament in a light bulb is made of tungsten, a metal with a high melting point, which glows when current passes through it.

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Key Insights

  • ⚡ The filament in a light bulb is made of tungsten, a metal with a high melting point.
  • 🙂 Tungsten is chosen for the filament due to its ability to emit visible light when heated.
  • 😎 The filament is sealed inside a glass chamber to prevent oxygen from reaching it and causing it to catch fire.
  • 💡 A fused bulb refers to a bulb with a broken filament, which prevents the current from flowing and the bulb from glowing.
  • 💡 Checking the filament of a bulb is important before assuming there is an issue with the electrical circuits.
  • ⚡ Tungsten's high melting point makes it more suitable for use in light bulb filaments compared to other metals.
  • 💡 The glowing filament in a light bulb is what emits visible light.

Transcript

hello friends this video on electric current and its effects part 6 is brought to you by example.com no more fear from exam let us now talk about yet another interesting fact i have been telling you that since current flows through the circuit that is why the bulb glows now what is it in the bulb that makes it glow what is it that is glowing becaus... Read More

Questions & Answers

Q: What makes a light bulb glow?

The filament inside a light bulb glows when electricity passes through it. The filament is made of tungsten, which has a high melting point and emits visible light when heated.

Q: Why is tungsten chosen as the filament material?

Tungsten is chosen because it has a very high melting point, allowing it to withstand the heat generated by the electricity passing through it without melting.

Q: Why is the filament sealed inside a glass chamber?

The glass chamber surrounding the filament ensures that there is no oxygen present around it. Tungsten can catch fire easily in the presence of oxygen at high temperatures, so the chamber prevents this from happening.

Q: What happens when a bulb is fused?

When a bulb is fused, it means that the filament inside the bulb is broken. Even if the circuit is complete, the current cannot flow through the broken filament, resulting in the bulb not glowing.

Summary & Key Takeaways

  • The filament in a light bulb is a thin wire made of tungsten, which glows when electricity passes through it.

  • Tungsten is chosen as the filament material because it has a very high melting point, allowing it to emit visible light before melting.

  • The filament is sealed inside a glass chamber to prevent oxygen from reaching it, as tungsten can catch fire easily at high temperatures.

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