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Why a transformer makes that humming sound?

  • Writer: Mohit Desai
    Mohit Desai
  • May 4, 2020
  • 1 min read

If a magnetic steel sheet is magnetized and demagnetized then it expands and contracts respectively. This phenomenon is known as magnetostriction. In a transformer, we provide an AC supply. So the core (made up of laminated sheets of CRGO) expands and contracts in 1 full cycle. So due to this expansion and contraction that humming sound is made.


 
 
 

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