Class 7 Physics Electric Current and its Effects Electric Bell

Electric Bell 

  • Initially electric bell is at Situation 1 when no current is flowing.
  • When switch is pressed and current starts flowing, the electromagnet starts attracting iron bar (denoted by red arrow in Situation – 2).
  • This results in hammer hitting gong producing sound and breaking of circuit (denoted by black arrow)
  • When circuit breaks, current stops flowing and the bell goes to Position – 1 as the electromagnet loses its magnetism.
  • Again at Position – 1, since the switch is pressed, the process repeats.
  • Thus, charging and discharging of electromagnet results in hammer hitting the gong and producing sound.

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