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      Question

      How does a bulb glow when the switch is turned

      on?
      A The filaments touch each other Correct Answer Incorrect Answer
      B The filaments expand Correct Answer Incorrect Answer
      C The filaments get heated up due to current and lights up Correct Answer Incorrect Answer
      D Current does not flow through circuit Correct Answer Incorrect Answer

      Solution

      The bulb glows because the filaments get heated up due to current and lights up. β€’ The bulb work on the principle that when a metal is heated it starts emitting light at some point.is turned on β€’ When the switch is turned, an electric current is passed through β€’ When an electric current is passed through a conductor it generates heat, H = IR2t (Joule's equation), where I is the current, R is the resistance of the conductor and t is the time for which current is passed. β€’ This heat is used by the atomic electrons to get excited to higher energy levels from the ground state. β€’ When these electrons return back to their ground state, a light photon is emitted, and this is how a bulb glows.

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