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What happens to a filament inside a light bulb when electricity flows through it?
- a)It remains cool
- b)It emits a magnetic field
- c)It produces light by heating up
- d)It dissolves
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
What happens to a filament inside a light bulb when electricity flows ...
The filament in a bulb heats up due to the electric current, producing light.
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What happens to a filament inside a light bulb when electricity flows ...
Understanding the Filament in a Light Bulb
When electricity passes through the filament of a light bulb, several fascinating processes occur.
1. Heating Effect of Electricity
- When electric current flows through the filament, it encounters resistance.
- This resistance causes the filament to heat up significantly.
2. Incandescence
- As the filament reaches high temperatures (usually around 2000 to 3000 degrees Celsius), it begins to glow.
- This phenomenon is known as incandescence, where the filament emits visible light due to its heat.
3. Light Production
- The intense heat excites the atoms in the filament, causing them to emit photons, which are particles of light.
- This is why the light bulb shines brightly.
4. Material of the Filament
- Most light bulb filaments are made from tungsten due to its high melting point and ability to withstand extreme temperatures without melting.
5. Efficiency and Lifespan
- Traditional incandescent bulbs are not very energy-efficient as a lot of energy is lost as heat rather than light.
- However, they are simple in design and have been widely used for many years.
In summary, when electricity flows through the filament of a light bulb, it heats up and produces light through the process of incandescence. This transformation from electrical energy to light energy is what makes light bulbs an essential part of our daily lives.
When electricity passes through the filament of a light bulb, several fascinating processes occur.
1. Heating Effect of Electricity
- When electric current flows through the filament, it encounters resistance.
- This resistance causes the filament to heat up significantly.
2. Incandescence
- As the filament reaches high temperatures (usually around 2000 to 3000 degrees Celsius), it begins to glow.
- This phenomenon is known as incandescence, where the filament emits visible light due to its heat.
3. Light Production
- The intense heat excites the atoms in the filament, causing them to emit photons, which are particles of light.
- This is why the light bulb shines brightly.
4. Material of the Filament
- Most light bulb filaments are made from tungsten due to its high melting point and ability to withstand extreme temperatures without melting.
5. Efficiency and Lifespan
- Traditional incandescent bulbs are not very energy-efficient as a lot of energy is lost as heat rather than light.
- However, they are simple in design and have been widely used for many years.
In summary, when electricity flows through the filament of a light bulb, it heats up and produces light through the process of incandescence. This transformation from electrical energy to light energy is what makes light bulbs an essential part of our daily lives.
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What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer? for Class 7 2025 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer?.
What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer? for Class 7 2025 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 7 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What happens to a filament inside a light bulb when electricity flows through it?a)It remains coolb)It emits a magnetic fieldc)It produces light by heating upd)It dissolvesCorrect answer is option 'C'. Can you explain this answer?.
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