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  • How could the red light in the signal be made to go off and the green light come on?
  • Why do you think the filament glows and produces light when electricity passes through it?
  • Is there any writing on your light globe? Make a note of any writing for later reference in the discussion. You may have to use a hand lens.
  • What do you think is inside the glass surrounding the filament?
  • There is usually a glass blob on the two wires holding up the filament. This blob may have a colour. Check several other globes and see if there is a relationship between the colour of the glass blob and the numbers written on the side or top of the light globe.

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