Green Living

How does a light bulb turn on?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. When you turn on an ordinary lamp, electrons move from the wires in the wall outlet through the lamp's cord into the conductive metal components of your lamp. The electrons move through these metal components to the bulb, where they complete the electrical circuit that heats the bulb's filament and emits visible light. All the electrical power involved in this process usually comes from the electric power grid.

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