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when the coil wire in the bulb has electricity passing through it the wire heats up to then create light.

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Clara Lebsack

Lvl 10
1y ago
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Wiki User

6y ago
  • Electricity goes through the filament in the bulb.
  • The filament is made of a material that is not a good conductor and therefore offers "resistance" to the electricity going through it.
  • The "resistance" results in the filament is a form of friction to the electric current.
  • The electrical friction results in the wire getting warm, then hot, then very hot.
  • The filament gets so hot that it starts to glow, giving off light.
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Wiki User

9y ago

It passes an electric current and its temperature rises to about 3000 degrees C so that it is white-hot and gives off light. Unfortunately this type of bulb also produces a lot of heat, which is just wasted power.

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Wiki User

11y ago

To provide illumination by passing current and therefore, making it react with the gases inside the bulb and "light" up.

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Q: What does the filament inside a light bulb do?
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