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Q:

What effect of power is used in the filament lamp?

  • 1
    Thermal effect
  • 2
    magnetic effect
  • 3
    Gas ionization
  • 4
    Chemical effects
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Answer : 1. "Thermal effect"
Explanation :

The heating effect of current is used in a bulb because the current heats up the filament. It causes light to be emitted as a result of the filament burning.

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