When a bulb gets fused, it indicates that the filament inside has failed. Here’s a detailed explanation of what happens:
What Happens to the Filament?
- The filament is made of a thin wire, typically tungsten, that is designed to glow when electric current passes through it.
- When the current flows, the filament heats up and emits light.
- Over time, due to continuous heating and cooling, the filament becomes weak.
Breaking of the Filament
- Eventually, the filament can no longer withstand the stress and heat.
- It breaks, leading to an open circuit, which means electricity can no longer flow through the bulb.
- This results in the bulb no longer lighting up, known as the bulb being ‘fused.’
Why Does This Happen?
- Factors like high voltage, frequent switching on and off, and manufacturing defects can contribute to the filament breaking.
- The breakage often occurs at the point where the filament is the thinnest, making it more susceptible to breaking.
Conclusion
- When a bulb fuses, the filament is indeed broken (Option A).
- This is a common occurrence and indicates that the bulb needs to be replaced for proper functionality.
Understanding this process helps in grasping the basic principles of electrical circuits and components.