What Makes a Light Bulb Light Up?

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John Straub's lecture notes

LIGHT BULB Microwave experiment (Why does the light bulb light up?)

SOLVED: When an electric current starts flowing in an electric bulb, it starts emitting light because its (a) Filament starts emitting light and then gets heated up (b) Thick connecting wire starts

Does a light bulb's brightness depend on voltage or current? - Quora

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Does a light bulb's brightness depend on voltage or current? - Quora