The filament of a bulb glows due to

The filament of an electric bulb glows because of the heating effect of electric current. As the current passes through the bulb it heats the filament which gives off light.

  • A filament has lots of opposition or resistance to electricity.
  • The filament then heats up and becomes red-hot as a result of this it begins to glow, turning electrical energy into light energy.
  • It is because of the Joule effect, which means that as the electrical current flows through them, the resistances heat up.

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